The Amerisleep AS1 is a firm, 10-inch foam mattress for back sleepers and stomach sleepers who want their hips held level with very little sink. Its two-layer design feels flat, stable, and easier to move across than softer memory foam. That firmness is also its clear limitation: most side sleepers will need more cushioning under the shoulders and hips. A queen has a $1,349 list price, though Amerisleep runs frequent promotions and the checkout price can change.
Table of Contents
- The AS1 at a Glance
- Should You Buy the Amerisleep AS1?
- How the AS1 Was Evaluated
- Our Testing Experience
- Where the AS1 Wins—and Where It Doesn’t
- Construction, Policies, and Compatibility
- AS1 Performance Scores
- Who Will Sleep Well on the AS1?
- What to Consider Before Buying
- How the AS1 Compares With Alternatives
- How to Get the Best Results
- FAQs
The AS1 at a Glance
| Mattress | Overall Score | Pros | Cons | Ideal For |
|---|---|---|---|---|
| Amerisleep AS1 | 4.2/5 | Firm support; low motion transfer; easy repositioning | Limited side-sleeping pressure relief; noticeable seated-edge compression | Back and stomach sleepers; firm-foam shoppers; light sleepers sharing a bed |
Should You Buy the Amerisleep AS1?
The AS1 is a strong choice if you want firm foam without a slow, enveloping feel. It kept the midsection from dipping during back and stomach sleeping, absorbed partner movement well, and recovered quickly enough that turning over never felt difficult. Its 2-inch comfort layer provides a touch of contouring, but alignment takes priority over deep pressure relief.
It works best for people who spend most of the night on their back or stomach, along with couples who want a quiet surface. Dedicated side sleepers should pass: the shallow comfort layer does not give the shoulder and outer hip enough room to settle. The same goes for anyone who relies on a rigid edge while getting dressed or prefers a plush memory-foam hug.
How the AS1 Was Evaluated
The three-week evaluation combined nightly back, stomach, and side sleeping with repeatable bench checks. Marcus tracked heat buildup and daily edge use, while Mia logged longer side-sleeping sessions to catch pressure buildup. Jenna and Ethan handled partner-movement drills. The scoring covered support, cooling, pressure relief, motion isolation, responsiveness, edge support, and visible change after repeated loading.
Our Testing Experience
The mattress reached its full 10-inch height within 48 hours and felt firm from the first night. On our backs, the hips stayed close to level with the shoulders, and the surface eased lower-back tightness instead of letting the pelvis bow downward. A 44-pound weight compressed the center by 1.1 inches, which matched the shallow sink we felt while lying down. Stomach sleeping was similarly stable, with none of the soft dip that can pull the lower back into an uncomfortable curve.
Side sleeping exposed the trade-off quickly. Mia, who is more sensitive at the shoulders, began changing position after about 35 minutes because the upper foam stopped compressing before her shoulder felt fully settled. The AS1 gives some contouring, but it feels more supportive than pressure-relieving. That makes it noticeably flatter than the more adaptable memory-foam mattresses aimed at side sleepers.
Motion control was excellent. In three six-inch drop tests with a 10-pound ball, vibration at the opposite side faded in an average of 0.7 seconds. The foam also recovered to about 90% of its original height in 1.8 seconds after the weight was removed, so changing positions required little effort. Edge behavior depended on how it was loaded: lying near the perimeter still felt stable, but the same 44-pound weight produced 1.8 inches of compression near the edge. That difference was easy to notice while sitting down.
Temperature stayed controlled for an all-foam bed. The surface rose from 69.7°F to 78.4°F after 30 minutes of contact and cooled to 72.2°F within 10 minutes after we got up. After 1,500 weighted rolling cycles, the surface showed 0.08 inch of residual indentation and no new noise or obvious soft spot.
What we liked
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The firm core kept the hips level during back and stomach sleeping without making turns feel laborious.
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Partner movement faded quickly, which makes the AS1 a good foam option for light sleepers sharing a bed.
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The responsive surface avoided the slow, stuck feeling common to deeper memory foam.
Who it is best for
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Back sleepers who want firm lumbar support with only light contouring.
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Stomach sleepers who need the pelvis held close to the surface.
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Couples who value motion isolation more than bounce or a reinforced sitting edge.
Where it falls short
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Most side sleepers will feel pressure at the shoulder or outer hip during longer stretches.
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The perimeter compresses noticeably when used as a seat, even though lying support remains usable near the edge.
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There is not enough sink for shoppers who want a deep memory-foam cradle.
Where the AS1 Wins—and Where It Doesn’t
| Pros | Cons |
|---|---|
| Firm, even support for back and stomach sleeping | Too little cushioning for most dedicated side sleepers |
| Low motion transfer for shared sleep | Noticeable compression when sitting on the edge |
| Fast enough recovery for easy position changes | Limited contouring around the shoulders and hips |
| Controlled heat buildup for a firm all-foam bed | Little bounce for sleepers who prefer a springy surface |
| Simple construction with a 20-year warranty | Requires even support and should not be used on a box spring |
Construction, Policies, and Compatibility
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Queen price: $1,349 list price; promotional prices vary
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Feel: Firm (7/10 on Amerisleep’s current comparison scale)
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Profile: 10 inches
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Construction: 2 inches of Bio-Pur® foam over 8 inches of Bio-Core® foam
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Type: All-foam
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Cover: Soft, breathable cover with Refresh Cooling Technology
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Foam: Open-cell Bio-Pur® designed for quicker recovery and better airflow than conventional memory foam
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Certifications: Bio-Pur® foam is CertiPUR-US® certified and low in VOCs
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Fiberglass: Fiberglass-free
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Sleep trial: 100 nights; returns are available after the first 30 nights
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Shipping: Free in the continental U.S.; compressed and shipped by FedEx; most orders arrive within two weeks
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Warranty: 20 years; replacement for covered defects in years 1–10 and prorated replacement in years 11–20
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Origin: Made in the U.S. with U.S. and imported components; covers are sewn in Canada
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Sizes: Twin, Twin XL, Full, Queen, King, California King, and Split King
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Base: Use a solid or slatted foundation with gaps no wider than 2.75 inches, or an adjustable base; do not use a traditional box spring
AS1 Performance Scores
| Metric | Score (out of 5) | Remarks |
|---|---|---|
| Support | 4.7 | Strong hip lift and steady lower-back support |
| Cooling | 4.0 | Controlled heat buildup for an all-foam mattress |
| Pressure Relief | 3.6 | Comfortable on the back and stomach; limited shoulder and hip cushion on the side |
| Motion Isolation | 4.7 | Turns and bed exits produced brief, muted vibration |
| Responsiveness | 4.1 | Foam recovered quickly enough for easy position changes |
| Edge Support | 3.6 | Usable while lying near the edge, with more compression while sitting |
| Durability | 4.5 | Minimal residual indentation after repeated weighted rolling |
| Overall | 4.2 | Best for back and stomach sleepers who value stability over plushness |
Who Will Sleep Well on the AS1?
Start with your main sleep position. The AS1 makes the most sense if you follow a practical mattress selection process, sleep mostly on your back or stomach, and care more about alignment than deep cushioning. It also suits people who want a firm surface with low motion transfer but dislike feeling trapped in slow foam.
Lighter or pressure-sensitive sleepers and anyone who spends most of the night on their side should look at the 12-inch, medium Amerisleep AS3 all-foam model instead. It adds a transition layer and more cushioning at the shoulders and hips. If you still want a firm feel but prefer a springier surface and a sturdier sitting edge, the Saatva Classic in Firm is the better match, though it costs considerably more.
What to Consider Before Buying
The AS1’s shallow comfort layer leaves little room for a side sleeper’s shoulder to settle, so pressure can build during longer stretches. The perimeter remains usable while lying down but compresses enough while sitting to feel less secure. It is also the wrong choice if you want deep, slow contouring or the bounce of coils.
How the AS1 Compares With Alternatives
Choose the AS1 when you want a quiet, one-sided firm foam mattress that resists hip dip and remains easy to move across. Among the closest alternatives, the differences come down to firmness range, contouring depth, edge response, and budget.
The Brooklyn Bedding Plank Firm is the most direct comparison. It is also a 10-inch all-foam bed, but its flippable design gives you a firm side and an extra-firm side. Its standard queen price sits close to the AS1’s, making it the better choice if you want maximum firmness or the option to change sides. The AS1 feels less extreme and has the more straightforward one-sided design.
The TEMPUR-Adapt uses denser, slower-moving material and delivers much deeper contouring with stronger pressure relief. Its medium feel is easier on side sleepers, but repositioning takes more effort and the queen costs well over twice as much as the AS1 at regular price. It is an upgrade in contouring, not a direct value competitor.
The Saatva Loom & Leaf comes in Relaxed Firm and Firm versions, adds a plusher quilted surface, and includes in-room delivery. Its Firm option suits sleepers who want substantial support without giving up the dense memory-foam hug. It is also a premium purchase, so the AS1 remains the better value if simple, firm support is the priority.
How to Get the Best Results
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Give your body several weeks to adjust before deciding whether the firm feel works for you.
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If you occasionally sleep on your side, use a thin topper; a thick one can undermine the support that makes the AS1 work.
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Rotate the mattress every three to six months to promote even wear; do not flip it.
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Use a solid platform or slats spaced no more than 2.75 inches apart.
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Use breathable sheets and lighter bedding if you tend to sleep warm.
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Unbox the mattress on its foundation so you do not have to move it after it expands.
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Keep pillow loft modest when stomach sleeping to avoid pushing the neck too far back.
FAQs
Is the Amerisleep AS1 good for side sleepers?
Not for most dedicated side sleepers. Its 2-inch comfort layer does not let the shoulder and outer hip sink far enough during long side-sleeping stretches. A softer mattress is the safer choice if that is your main position.
Does the Amerisleep AS1 sleep hot?
It controls heat well for an all-foam bed. The firm surface limits how deeply the body sinks, while the breathable cover and open-cell comfort foam help heat dissipate. Hot sleepers should still use breathable sheets and lighter bedding.
How well does it isolate motion?
Motion isolation is one of the AS1’s best features. Turns and bed exits stayed localized, and vibration from the drop test faded in less than a second on average. That makes it a good match for couples when one person wakes easily.
What base works best with the Amerisleep AS1?
Use a solid platform, an adjustable base, or a slatted foundation with gaps no wider than 2.75 inches. Do not place the AS1 on a traditional box spring because foam needs a flat, stable support surface.
