FORM Prime Mattress Review (2026) | Expert Tested

Our Review Process: Each mattress we review undergoes a rigorous evaluation process. We assess comfort, support, cooling, and durability through both subjective experiences and objective tests.

Criteria include pressure relief, spine alignment, mattress responsiveness, motion transfer, edge support, and temperature regulation. This comprehensive approach ensures our reviews are thorough and unbiased.

I. Mattress Layers, Materials, and Construction

When I examine a mattress, I always start by understanding what’s inside. The FORM Prime uses a five-layer system that combines their signature GelGrid™ comfort layer with a zoned pocketed coil base. Each layer has a distinct job, and when you lie on this mattress, you can genuinely feel them working together.

Starting from the base is the BaseFlex™ foundation layer. This isn’t just filler foam — it’s a dense encasement system designed to reinforce the perimeter of the mattress and support the coil system from beneath.

When I pressed along the edges, I could feel this layer holding firm in a way that immediately differentiated the FORM Prime from softer-edged competitors.

Above that sits the ZoneCoil™ 7-Series pocketed coil layer. FORM has divided this coil system into seven targeted zones, each calibrated to provide appropriate firmness for different areas of the body. The coils are individually wrapped, which helps with both motion isolation and airflow.

The zone design means your shoulders receive slightly more give while your lumbar region receives firmer reinforcement — support that adapts to your shape rather than treating your whole body the same.

Next is the ContourFlex™ transition foam layer, a 3-inch bridging layer that sits between the coil system and the gel grid above. Transition layers often get overlooked in mattress reviews, but this one earns its keep.

Without it, hybrid mattresses can feel disconnected — springy in one moment, foamy the next. The ContourFlex™ creates a smooth handoff so the surface feel remains cohesive and intentional.

Above the transition layer is FORM’s proprietary GelGrid™ + Integra-Mesh™ comfort layer. This is the defining feature of every FORM mattress and what genuinely separates it from traditional hybrids.

The GelGrid™ is a polymer grid made up of thousands of open-air cells that flex under pressure to relieve tension at contact points while allowing heat to escape continuously.

What makes the FORM Prime’s version different from competing grid mattresses is the Integra-Mesh™ reinforcement woven into the grid itself. This significantly reduces the surface jiggle and instability that other grid designs are known for.

When I first lay down, the difference was immediately noticeable — responsive and buoyant, but without any of the unsettled, wobbly feeling I’ve experienced on other grid surfaces.

Finally, the mattress is wrapped in the AeroWeave™ cover, a well-ventilated textile designed to promote consistent airflow across the sleep surface. The stitching pattern itself is open and breathable, and even the back panel of the mattress features ventilation. When I examined the cover closely, it was clear this wasn’t decorative — the airflow design is functional from edge to edge.

During my inspection, I looked carefully for construction flaws. The stitching was clean and consistent throughout, with no loose threads or uneven tension. The layers felt well-integrated without any gaps or soft spots that might indicate misalignment during assembly.

The mattress is made in the USA, and the craftsmanship reflects that. There’s a solidity to the FORM Prime that you notice immediately — not just in how it feels underfoot, but in how it holds its shape when you push on it from different angles.

The 14-inch profile contributes to both the mattress’s aesthetic presence and its structural integrity. More material depth means more room for the coil system to do its job without compression bottoming out. It does require deep-pocket sheets and a small step up into bed, but neither of those is an unusual ask at this height.

II. Sleeping Positions

Your preferred sleep position determines how much pressure your body places on different mattress areas and what type of support you need most. Some mattresses excel for side sleepers but fail stomach sleepers, while others provide great back support but create pressure points for side sleeping.

I tested the FORM Prime extensively across all major sleep positions to evaluate how its zoned coil support, GelGrid™ comfort layer, and hybrid construction perform for different body alignments and pressure distribution needs.

Side Sleeping

Mattresses for side sleepers need to allow the shoulder and hip to sink in enough to keep the spine neutral, without creating a hammock effect that throws alignment off.

The FORM Prime’s shoulder zone rates approximately 4.5 out of 10 on firmness — slightly softer than the Core Hybrid, which FORM attributes to the additional give of the 3-inch ContourFlex™ transition layer.

When I lay on my side, the GelGrid™ flexed immediately at my shoulder and hip, creating genuine pressure relief without the sensation of sinking into the mattress. My spine stayed in a neutral position throughout.

The give felt precise rather than indiscriminate — the grid cells compressed where I needed them to and held firm where I didn’t. I spent several full nights sleeping on my side while testing the mattress and woke without the shoulder tension I sometimes experience on firmer surfaces.

Side sleepers who need extra shoulder cushioning should pay attention to the 4.5/10 shoulder zone rating. In testing, that zone felt meaningfully softer than the lumbar zone, which gave my shoulder more room to sink while the center of the mattress stayed more supportive.

Back Sleeping

Mattresses for back sleepers need consistent spinal support with enough contouring to accommodate natural lumbar curvature.

The FORM Prime performed excellently here. The ZoneCoil™ system provided firm support along my lower back without creating any pressure points, while the GelGrid™ above conformed naturally to the curve of my spine.

I never felt like my midsection was either suspended or sinking — it was the kind of balanced support that’s genuinely hard to describe until you feel it.

The responsiveness of the gel grid also benefits back sleepers who tend to shift positions. Even small movements were accommodated immediately, without the lag time that can disrupt light sleepers when adjusting position in the night.

Stomach Sleeping

Stomach sleepers need a surface firm enough to prevent the midsection from sinking into the mattress, which would strain the lower back.

FORM’s gel grid adapts so naturally to the body that even in a stomach-lying position, I didn’t experience excessive hip sinkage.

The ZoneCoil™ 7-Series provides reinforced support in the midsection zone, which helps maintain a flat, neutral sleeping plane for stomach sleepers.

That said, dedicated stomach sleepers who require a very firm, unyielding surface should test this mattress carefully during the trial period. The GelGrid™ does flex — that’s by design — and some stomach sleepers prefer no give at all.

The FORM Prime is a strong option as a mattress for stomach sleepers, but very firm preference is the one scenario where personal testing is especially important.

Combination Sleeping

This is where the FORM Prime truly distinguishes itself. The gel grid’s inherent bounce combined with the pocketed coil system creates one of the most responsive mattresses for combination sleepers I’ve tested.

Rolling from back to side to stomach required no effort — the mattress adjusted instantly to each new position without any delay or resistance.

There’s no “quicksand” effect that some memory foam surfaces create. For combination sleepers, I can’t imagine a more accommodating surface.

I also tested the mattress on FORM’s adjustable base frame. The Prime flexed cleanly into the zero-gravity preset — legs elevated, head slightly raised — with zero bunching, no gaps in the sleep surface, and no hammocking. It locked into position immediately and held it securely through the adjustment.

If you’re planning to use an adjustable frame, the FORM Prime handles it exceptionally well.

III. Mattress Responsiveness

Responsiveness determines how easily you can move around and change positions during sleep. A mattress that’s too slow to respond can make you feel trapped or require extra effort to roll over.

A mattress that bounces back too quickly might feel unstable. The sweet spot balances controlled movement with immediate recovery.

This characteristic becomes especially important for combination sleepers who switch between back, side, and stomach positions throughout the night. It also affects intimacy, getting in and out of bed, and sitting on the edge for daily activities.

I used 10-pound weights to measure the mattress’s recovery speed. I dropped the weights onto the surface from a consistent height, then observed how quickly they bounced back. This gives an objective measure of how the materials respond to sudden pressure changes.

The results were remarkable. The weights went flying the moment they made contact with the mattress.

I don’t say that lightly. I’ve tested a lot of mattresses with this method, and the FORM Prime’s response was among the most dramatic I’ve seen.

What I would attribute this to is the GelGrid™ layer sitting immediately beneath the AeroWeave™ cover. Gel grids are inherently bouncy by nature, and FORM’s version, reinforced by Integra-Mesh™, delivers that bounce with stability rather than wobble.

During my actual sleep testing, I never once felt stuck or restricted. Every position change happened without effort or the slight delay that even good memory foam creates. The mattress felt alive and immediately responsive underneath me.

I gave the FORM Prime a 10 out of 10 for response time. For combination sleepers, couples, and anyone who moves during the night, this mattress delivers responsiveness that’s difficult to match in the hybrid category.

IV. Mattress Motion Isolation

Motion isolation can make or break a shared sleeping experience. When your partner gets up for a midnight bathroom trip or shifts around during sleep, you shouldn’t be bounced awake. For couples, having a motion-isolating mattress is important practicality.

Even the best hybrid mattresses face an inherent tension here: coil systems can transmit motion across the sleep surface, especially when coils are interconnected.

Individually wrapped coils perform significantly better, but the real differentiator in the FORM Prime is the combination of wrapped coils with the GelGrid™ + Integra-Mesh™ layer above.

The Integra-Mesh™ was specifically engineered to reduce the surface ripple — what FORM calls “grid jiggle” — that other grid mattresses transmit when one partner moves.

I placed a mason jar on one side of the mattress and simulated tossing and turning on the other side. Rolling over, sitting up, shifting weight — all of it.

The jar barely moved at all. The motion dampening was impressive, and it aligned precisely with what I experienced during actual sleep testing with my husband. Even when he was restless, I was aware of it only faintly. It wasn’t jarring or disruptive. I wasn’t woken up.

This is what good motion isolation feels like in practice — not the total stillness of a dense all-foam mattress, but close enough that it doesn’t matter.

I gave the FORM Prime a 10 out of 10 for motion isolation. For a hybrid mattress at this price point, that score reflects outstanding engineering. The Integra-Mesh™ reinforcement is doing real work here, and it shows.

V. Mattress Edge Support

Edge support matters more than most people expect until they experience its absence.

Whether you’re sitting on the side of the bed to put on shoes, lying near the perimeter, or sharing a mattress and trying to use the full surface, a well-supported edge makes a meaningful difference in daily comfort.

The FORM Prime earns its edge support through a layered structural approach.

The BaseFlex™ foam encasement wraps the perimeter of the ZoneCoil™ 7-Series, providing a defined, firm boundary around the coil system.

Above that, the Integra-Mesh™ reinforcement in the GelGrid™ continues to provide structural stability all the way to the edge.

I tested by sitting as close to the edge as possible with my full weight. There was a small amount of compression — all mattresses dip under concentrated point pressure — but the edge held firm and I never felt at risk of sliding off or rolling over the side.

The perimeter had a clear, defined feel beneath me. As I eased closer to the very edge, that integrity remained. Impressive.

When I lay down near the perimeter with my weight spread across a larger surface area, the edge performed even better. No dipping, no instability, no sense of being near a boundary at all. I slept comfortably near the edge during testing nights without any concern.

At a premium price point, edge support shouldn’t be a question — and with the FORM Prime, it isn’t.

I gave the FORM Prime a 10 out of 10 for edge support.

VI. Cooling and Breathability

Sleep temperature affects everything from how quickly you fall asleep to how deeply you stay asleep. Hot sleepers especially know how disruptive an overly warm mattress can be.

The FORM Prime takes a multi-layered approach to cooling.

The AeroWeave™ cover is visibly and functionally ventilated — the weave pattern promotes consistent airflow across the sleep surface, and even the stitching along the back panel is designed to breathe.

The GelGrid™ layer beneath is made up of thousands of open-air cells that actively channel heat away from the body rather than absorbing it.

Unlike traditional foam, the grid cells stay open under pressure, so airflow doesn’t compress out when you lie down. Heat moves through and out, rather than accumulating beneath you.

And at the base, the ZoneCoil™ 7-Series pocketed coil system provides the structural airflow that all hybrid mattresses benefit from — open channels throughout the support core that prevent heat from pooling.

The mattress is slightly cool to the touch when you first lie down, which is a pleasant and noticeable quality. It isn’t as dramatically cold as a phase-change cooling cover, but the breathability is consistent and genuine.

I personally did not overheat during any of my sleep testing on the FORM Prime. The combination of the grid layer and the ventilated cover created an environment that stayed comfortable throughout the night.

I would describe the temperature experience as neutral-to-cool — not a cold shock, but also never warm in the way that foam-heavy mattresses tend to become after an hour of contact.

I gave the FORM Prime a 9 out of 10 for cooling and breathability. It performs exceptionally well within its construction category.

The one point held back reflects that the cover, while breathable, doesn’t use active phase-change or infused cooling fiber technology the way some premium cooling covers do.

That said, for most sleepers — including many who consider themselves hot sleepers — the FORM Prime’s cooling approach should deliver a genuinely comfortable night.

VII. Durability and Longevity

A mattress that won’t sag is a significant investment that you’ll use every single night for years. Nobody wants to replace a sagging, uncomfortable mattress after just two years. With the FORM Prime, there are several strong indicators of long-term durability.

The mattress comes with a lifetime warranty, which immediately signals that FORM stands behind its construction. A lifetime warranty isn’t marketing fluff — it’s a contractual commitment to the materials and assembly. It covers manufacturing defects and structural failures for as long as you own the mattress.

The FORM Prime is made in the USA, which typically indicates tighter quality control and more consistent assembly than imported alternatives.

FORM uses CertiPUR-US® certified foams throughout, meaning the materials have been tested for durability as well as safety and emissions. The mattress also carries GREENGUARD Gold and OEKO-TEX® Standard 100 certifications, both of which require ongoing compliance rather than one-time approval.

When I examined the mattress closely, I found no weak points, gaps between layers, or areas of inconsistent construction.

The stitching on the AeroWeave™ cover was clean and even throughout.

The coil system responded uniformly across the surface without any coils feeling loose or improperly tensioned.

The GelGrid™ layer felt structurally cohesive — there’s no soft-spot wobble that might indicate grid degradation.

The Integra-Mesh™ reinforcement within the GelGrid™ layer also contributes to long-term resilience. One common concern with grid mattresses is that the cells can fatigue over time and lose their shape. Integra-Mesh™ is specifically designed to prevent that breakdown, reinforcing the structure of the grid so it maintains consistent performance over years of use.

I have no concerns about the durability or longevity of the FORM Prime. The materials, construction quality, US manufacturing, and lifetime warranty together make a compelling case that this is a mattress built to last.

VIII. Potential Drawbacks

No mattress is right for everyone. Here’s an honest look at who might want to skip the FORM Prime.

Height

At 14 inches, this is a tall mattress. If you’re someone who struggles to get in and out of bed, or if you simply prefer a lower-profile sleeping surface, the FORM Prime isn’t for you. You’ll also need deep-pocket sheets, which may add to the overall cost.

Single firmness option

Unlike some competitors at this price point, the FORM Prime comes in one feel. There’s no plush or firm version to choose from. The shoulder zone is approximately 4.5/10, which makes it a natural fit for side sleepers and combination sleepers, but sleepers who need a very firm surface — dedicated stomach sleepers or heavier back sleepers — may find the feel too soft for their needs.

Grid construction

If you’re looking for a traditional foam hybrid or an all-foam mattress, the FORM Prime won’t feel familiar. The GelGrid™ layer has a distinct, buoyant quality that feels different from both foam and latex. Most people find it comfortable immediately, but it’s worth acknowledging that it’s unconventional.

Natural materials

If you’re shopping for a mattress made with natural or organic materials — latex, organic cotton, wool — you would skip the FORM Prime. The construction is made up of proprietary synthetic materials, and there are no natural fiber or latex options within the Prime line.

Price point

The FORM Prime is a premium mattress, currently priced at $2,599 for a queen. It is priced lower than the Purple Restore Plus Hybrid, which it competes with directly, but it’s still a significant investment. Budget-conscious shoppers will find alternatives at lower price points, though they will sacrifice some of what makes the FORM Prime’s construction distinctive.

IX. Trial Period, Warranty, Pricing, and Sizes

Sleep Trial

The FORM Prime comes with a 365-night sleep trial — one of the longest in the mattress industry. This means a full year of sleeping on the mattress before committing. If it doesn’t work for you, FORM will arrange free pickup with no restocking fees.

Compare this to some competitors at this price tier where returns can involve fees of $99 or more just for white glove pickup, in addition to restocking charges and other costs.

Warranty

The FORM Prime carries a lifetime warranty. This covers manufacturing defects, significant structural sagging, and materials that deteriorate beyond normal wear. It is not a 10-year pro-rated warranty — it’s lifetime coverage, which represents above-average confidence in the product’s durability.

Pricing

At the time of this review, the FORM Prime is priced at $2,599 for a queen (on sale from $2,999). Make sure to check FORM’s site for current pricing, as promotions may vary.

When compared to the Purple Restore Plus Hybrid — the most direct competitor at this tier based on shared gel grid technology — the FORM Prime comes in at a lower price point with a longer trial (365 vs. 100 nights) and free returns with no restocking fees.

Available Sizes

The FORM Prime comes in all standard mattress sizes: twin, twin XL, full, queen, king, and California king. FORM lists exact dimensions for each size on their website if you need to verify fit with your bed frame or bedroom layout.

Delivery

One detail worth highlighting at this tier: the FORM Prime ships free with white glove delivery. The team brings the mattress to your room of choice and can remove your old mattress if you want them to. Because the mattress arrives at full size — not compressed — there’s no expansion wait time and no off-gassing. It’s ready to sleep on immediately.

X. Environmental Impact

Environmental considerations rarely lead a mattress purchase, but they’re worth understanding.

The FORM Prime is manufactured in the United States, which carries real environmental advantages over imported alternatives. Shorter transportation distances mean reduced emissions per mattress delivered. US manufacturing also means compliance with more stringent environmental standards during production.

All foams in FORM mattresses carry CertiPUR-US® certification, which tests for environmental performance, material content, and indoor air quality. CertiPUR-US® certified foams are free of formaldehyde, ozone depleters, mercury, lead, and other heavy metals. FORM mattresses also hold GREENGUARD Gold and OEKO-TEX® Standard 100 certifications — both of which evaluate for chemical emissions and overall material safety.

The FORM Prime is fiberglass-free, which eliminates a material associated with disposal challenges and contamination risks if the cover is ever damaged.

As with most conventional mattresses, the foam layers are petroleum-derived synthetics that don’t biodegrade naturally and require energy-intensive manufacturing. The GelGrid™ polymer layer is a proprietary synthetic material. There are no natural latex, organic cotton, or wool components in the construction.

Within conventional mattress construction, the FORM Prime’s certifications and US manufacturing represent meaningful commitment to environmental and safety standards. It isn’t a natural or organic mattress, and it shouldn’t be positioned as one. But the certifications it carries are legitimate and substantive, not cosmetic.

XI. Maintenance and Care

Proper care extends your mattress’s lifespan and maintains its performance over time. Here’s what you need to know to keep the FORM Prime in top condition.

Use a mattress protector. FORM recommends this, and so do I. A breathable protector guards against spills, body oils, and moisture that can degrade foam and grid materials over time. Choose one that doesn’t trap heat and compromise the mattress’s natural breathability.

Never flip the mattress upside down. The AeroWeave™ cover should always face up. The layers are engineered to function in a specific order, and inverting the mattress would place the support base where you sleep — which defeats the purpose of every layer above it.

You can rotate the mattress from head to foot if you’d like to, but FORM doesn’t require it. If you do choose to rotate, every six months is a reasonable interval for even wear prevention. The handles will come in handy here!

Spot clean as needed using a barely damp cloth with mild detergent. Blot stains rather than rubbing them, which can push moisture deeper into the grid and foam layers. Allow any cleaned area to dry completely before replacing bedding.

Wash your sheets regularly. This is one of the simplest and most effective things you can do to protect any mattress. Weekly or bi-weekly washing prevents oil and sweat buildup that gradually penetrates even a good mattress protector over time.

Use a compatible foundation. The FORM Prime works with platform beds, slatted frames with slats no more than 3 inches apart, solid foundations, and adjustable bases. Ensure your frame can support the weight of the mattress plus sleepers — this is a 14-inch mattress with a substantial coil system, and adequate foundation support directly affects long-term performance.

XII. Final Verdict

Thanks for joining me on my comprehensive review of the FORM Prime mattress. Overall, I would give this mattress a 10 out of 10, and I especially appreciate the response time and the edge support — both of which reflect genuine engineering rather than marketing claims.

The FORM Prime is a well-built, thoughtfully designed premium hybrid. The GelGrid™ + Integra-Mesh™ combination delivers on its promises: genuinely responsive, genuinely cooling, and genuinely stable in a way that other grid mattresses often aren’t. The ZoneCoil™ 7-Series base gives the mattress structural integrity that supports everything above it, and the BaseFlex™ perimeter ensures that edge support is a strength rather than an afterthought.

The 365-night trial is among the most generous in the industry, returns are free with no restocking fees, and the lifetime warranty is exactly that — not a 10-year pro-rated policy, but a lifetime commitment.

Where the FORM Prime has limitations: it’s a tall mattress at 14 inches, it comes in only one firmness, it’s made entirely of synthetic materials, and it’s priced at the premium tier. Sleepers who need very firm support, prefer all-natural construction, or are working within a tight budget will need to look elsewhere.

But for combination sleepers, side sleepers with shoulder sensitivity, couples who want both responsiveness and motion isolation, and hot sleepers who need a genuinely breathable surface — the FORM Prime is one of the strongest options available at this price point.

Final Tally

XIII. FAQs

What type of sleeper is the FORM Prime best suited for?

The FORM Prime works especially well for side sleepers, combination sleepers, and couples. The shoulder zone is approximately 4.5 out of 10 firmness, which gives enough give for side sleeping pressure relief while the zoned coils provides the lumbar support back sleepers need.

Stomach sleepers who require a very firm surface should test it carefully during the trial period.

How tall is the mattress and do I need special sheets?

The FORM Prime is 14 inches tall. You’ll need deep-pocket sheets to accommodate the height. Standard fitted sheets won’t stay on properly, so budget for compatible bedding when you purchase.

Is the FORM Prime good for hot sleepers?

Yes. The AeroWeave™ cover, open-cell GelGrid™ layer, and ZoneCoil™ pocketed coil base work together to create consistent airflow and breathability throughout the mattress. The GelGrid™ channels stay open under pressure, so heat moves out rather than building up beneath you.

I gave it a 9 out of 10 for cooling, and I was consistently comfortable throughout testing.

How does motion isolation work for couples?

The FORM Prime scored 10 out of 10 for motion isolation in my testing, which is exceptional for a hybrid. The Integra-Mesh™ reinforcement within the GelGrid™ is specifically designed to reduce surface ripple and partner disturbance.

During my sleep testing with my husband, I was barely aware of his movements — not enough to disrupt my sleep.

Does the FORM Prime contain fiberglass?

No. FORM mattresses are fiberglass-free. The fire barrier materials used are safer alternatives that don’t pose the contamination risks associated with fiberglass.

What are the main drawbacks of this mattress?

The FORM Prime is a tall mattress at 14 inches, which may be challenging for some to get in and out of. It comes in only one firmness level, so it’s not the right fit for sleepers who need a very firm surface or a very plush one.

It’s made entirely of synthetic materials, so it’s not for buyers seeking natural or organic construction. And it’s priced at the premium tier, which won’t fit every budget.

What does the lifetime warranty cover?

The lifetime warranty covers manufacturing defects, structural sagging beyond specified thresholds, and materials that deteriorate abnormally. It does not cover normal softening over time, damage from misuse, or cosmetic wear.

This coverage is notably stronger than the 10-year standard most mattress companies offer.

How does delivery work?

The FORM Prime is made to order and arrives at full size with free white glove delivery. The team brings the mattress to your room of choice and can remove your old mattress as well. Because it arrives at full size, there’s no expansion wait time and no off-gassing smell. It’s ready to sleep on immediately.

Can I use the FORM Prime on an adjustable base?

Yes. I tested the FORM Prime on FORM’s own adjustable base and it performed excellently. It flexed cleanly into the zero-gravity preset with no bunching, no gaps, and no sliding. FORM recommends verifying compatibility with your specific adjustable base, but the hybrid construction handles articulation well.

Do I need to flip or rotate the mattress?

Never flip the FORM Prime upside down — the AeroWeave™ cover should always face up. The layer order is intentional and inverting it would compromise every element of the design. You can rotate the mattress from head to foot if you’d like to encourage even wear, though FORM doesn’t require it.

What certifications does the FORM Prime carry?

The FORM Prime holds CertiPUR-US®, GREENGUARD Gold, and OEKO-TEX® Standard 100 certifications. All foams are free of formaldehyde, ozone depleters, mercury, lead, and other heavy metals. It is also fiberglass-free and manufactured in the USA.

What sizes are available?

The FORM Prime comes in all standard mattress sizes: twin, twin XL, full, queen, king, and California king. FORM lists exact dimensions for each size on their website if you need to confirm fit for your bed frame or bedroom layout.

How do I care for the FORM Prime?

Use a mattress protector to guard against spills and body oils. Spot clean with a barely damp cloth and mild detergent as needed, and allow the area to dry fully before replacing bedding.

Never flip the mattress. Rotate head to foot every six months if desired. Wash your sheets regularly — this goes a long way toward protecting any mattress over time.