by Amerisleep AS1 Review 2026: Firm 7/10 Foam Tested for Back & Stomach Sleepers
Firmest mattress in the AS lineup. 10” tall, Bio-Pur plant foam, $849 queen — the most affordable Amerisleep model. Tested independently over 30 nights.
TL;DR — Amerisleep AS1 Overall Score
- Firmness: 7/10 — firmest in the AS lineup, suitable for back and stomach sleepers
- Cooling: 9.0/10 — thin foam stack lets heat dissipate faster than deeper models
- Edge support: 8.2/10 — high-density base foam holds the perimeter well
- Motion isolation: 8.5/10 — all-foam construction absorbs motion effectively
- Pressure relief (side): 7.0/10 — too firm for side sleepers under 200 lb
- $200 less than AS2 at list; 100-night trial and 20-year warranty match the full AS lineup
What this review covers
Construction: What Is Inside the AS1
The AS1 is a 10-inch all-foam mattress built on three layers. It is the most straightforward construction in the Amerisleep lineup, and that simplicity is intentional. The design targets firm-feel preference sleepers who do not need deep compression or multiple comfort transitions. Understanding each layer explains why the AS1 performs as it does across test categories.
Total stack: 2” + 2” + 6” = 10”. The AS1 is the shortest Amerisleep model, and that thinness has a direct effect on thermal performance. Less foam depth means less insulating mass — contributing to the 9.0/10 cooling score in testing. For back and stomach sleepers who do not need deep pressure relief, the thin construction is a feature rather than a limitation.
Amerisleep positions the AS1 as the firm end of the lineup. The five AS models run from AS1 (firm, 7/10) through AS2 (medium-firm, 6/10), AS3 (medium, 5/10), AS4 (medium-soft, 4/10), and AS5 (soft, 3/10). The AS1 is the only model unambiguously suited to strict stomach sleepers who need hip elevation under pressure. For context on where the AS1 fits relative to the wider brand, see our Amerisleep mattress reviews hub.
Full Specs Table
| Spec | Details |
|---|---|
| Price (queen) | $849 list / ~$552 with 30% off — most affordable Amerisleep model |
| Total height | 10” — shortest in the AS lineup |
| Comfort layer | Bio-Pur plant-based memory foam, 2” |
| Transition layer | Affinity foam, 2” (no HIVE zoning on AS1) |
| Support base | Bio-Core high-density base foam, 6” |
| Firmness | Firm, 7/10 — firmest in the AS lineup |
| Firmness options | 1 (Firm only) |
| Trial period | 100 nights |
| Warranty | 20 years |
| Delivery | Free ground shipping (compressed in box) |
| Certifications | CertiPUR-US certified foams |
| Best for | Stomach sleepers, back sleepers (firm preference), heavy sleepers up to 230 lb, guest rooms |
| Available sizes | Twin, Twin XL, Full, Queen, King, California King, Split King |
30-Night Test Results
MattressNut tested the AS1 over 30 nights with three rotating sleeper profiles: stomach sleeper at 175 lb, back sleeper at 200 lb, and side sleeper at 145 lb. The stomach and back sleeper profiles are the primary audience for a 7/10 firm mattress; the side sleeper profile was included specifically to document where the AS1 falls short. All testing was conducted in a climate-controlled room at 68°F. Pressure mapping, 8-hour heat-pad cooling tests, edge load tests at 185 lb seated, and a motion transfer drop test were run at 15-day and 30-day marks to account for foam break-in.
AS1 scores after 30 nights:
Pressure Relief: Back and Stomach (9.0/10)
For back and stomach sleepers, the AS1’s firm profile performs well. The 6-inch Bio-Core base prevents excessive hip sinkage — the primary structural requirement for stomach sleepers, where spinal alignment depends on the hips staying level with the shoulders. Our pressure mapping at 175 lb in the prone position showed low peak pressure across the lumbar and pelvis, with the mattress surface distributing load without the hip dip characteristic of medium-firm or softer models. Back sleepers at 200 lb showed similar results: the 7/10 firmness provided consistent lumbar support without the pressure buildup at the sacrum that over-soft mattresses produce.
Pressure Relief: Side Sleepers (7.0/10)
This is the defining limitation of the AS1. Our 145 lb side sleeper profile showed pronounced pressure at the greater trochanter and acromion — the hip and shoulder contact points in the lateral position. A 7/10 firm surface does not have enough give to allow the shoulder to sink and the spine to align laterally. The 7.0/10 score reflects measurable pressure buildup that, over a full night, would translate to numbness or discomfort in the hip and shoulder for most side sleepers under 200 lb. Side sleepers above 200 lb body weight generate enough compressive force to engage the foam more effectively, but even there the AS1 is not recommended for primary side sleeping. The AS3 (5/10 medium with full HIVE zoning) is the appropriate recommendation for side sleepers.
Cooling (9.0/10)
The AS1 is the best-cooling model in the all-foam AS lineup, and the construction explains why. A 10-inch foam stack has less insulating mass than the 12-inch AS3 or taller models. In our 8-hour heat-pad test, the AS1 surface ran 0.4°F cooler on average than the AS3 all-foam across the full test period. Bio-Pur’s open-cell structure dissipates heat faster than conventional closed-cell memory foam, and the thinner comfort layer means body heat encounters less material before reaching the ventilated surface. For back and stomach sleepers who run warm, the AS1’s cooling performance is a practical advantage over the rest of the AS foam lineup.
Edge Support (8.2/10)
The high-density Bio-Core base layer provides solid edge support for an all-foam mattress. In our 185 lb seated edge test, the AS1 compressed 1.5 inches at the perimeter — less compression than the AS3 all-foam at 1.9 inches, reflecting the firmer construction throughout. For guest rooms and single sleepers who use the full sleeping surface, the AS1 holds its perimeter reliably. It is not at the level of a pocket coil edge (the AS3 Hybrid at 9.1/10), but it exceeds most all-foam mattresses at this price point.
Motion Isolation (8.5/10)
All-foam construction isolates motion well relative to coil-based alternatives. In our 10 lb drop test, the AS1 absorbed vibration effectively, registering 28 percent lower amplitude than a standard innerspring and comparable to other all-foam mattresses in this price bracket. For couples sharing the AS1, normal nighttime movement will not significantly disturb a sleeping partner. The 8.5/10 score matches the AS3 all-foam in this category — the foam type is similar enough that firmness level does not meaningfully change motion performance.
Pros and Cons
AS1: Pros
- Most affordable Amerisleep model — $552 queen with 30% off; significant savings vs AS2 ($682) and AS3 ($1,015)
- 9.0/10 cooling — thin 10” stack runs cooler than deeper AS foam models
- 9.0/10 pressure relief for back and stomach sleepers — firm base keeps hips level
- 8.5/10 motion isolation — all-foam construction absorbs movement well for couples
- 8.2/10 edge support — high-density Bio-Core base holds the perimeter effectively
- Bio-Pur plant-based comfort foam — lower VOC off-gassing than conventional memory foam
- Holds up well in guest rooms and low-use spare bedrooms due to firm density
- Same 100-night trial and 20-year warranty as the full AS lineup
- CertiPUR-US certified foams
AS1: Cons
- 7.0/10 pressure relief for side sleepers under 200 lb — too firm; expect shoulder and hip pressure
- No HIVE zoning in the Affinity transition layer — misses the adaptive softening that makes the AS3 comfortable for combination sleepers
- Limited audience — firm-only means the AS1 serves a narrower range of sleep positions than any other model in the lineup
- 100-night trial is shorter than competitors like Saatva (365 nights) and Awara (365 nights)
- Ships compressed in a box; no white-glove delivery option
- No Celliant cover (present on mid-range AS models)
- Side sleepers, combination sleepers, and lighter back sleepers should look at the AS2 or AS3
→ Check current AS1 price (30% off auto-applies)
AS1 vs AS2 vs AS3: How They Compare
The three most common Amerisleep comparisons for buyers considering the firm end of the lineup. The AS1 and AS2 are both designed for back and stomach sleepers; the AS3 extends coverage to side sleepers. Here is where each stands across tested categories and price:
| Category | AS1 (Firm 7/10) | AS2 (Med-Firm 6/10) | AS3 (Medium 5/10) |
|---|---|---|---|
| Price (queen, list) | $849 | $1,049 | $1,449 |
| Price (~30% off) | ~$552 | ~$682 | ~$1,015 |
| Total height | 10” | 11” | 12” |
| Firmness | Firm 7/10 | Med-firm 6/10 | Medium 5/10 |
| Cooling | 9.0 / 10 | 8.8 / 10 | 9.0 / 10 |
| Pressure (back/stomach) | 9.0 / 10 | 9.2 / 10 | 9.2 / 10 |
| Pressure (side, <200 lb) | 7.0 / 10 | 8.2 / 10 | 9.2 / 10 |
| Edge support | 8.2 / 10 | 8.0 / 10 | 8.0 / 10 |
| Motion isolation | 8.5 / 10 | 8.5 / 10 | 9.0 / 10 |
| Bounce | 7.5 / 10 | 7.2 / 10 | 6.5 / 10 |
| Best for | Stomach / back firm | Back + lighter side | Side + combination |
| Trial / warranty | 100 nights / 20 yr | 100 nights / 20 yr | 100 nights / 20 yr |
For a full breakdown of the AS2, see our Amerisleep AS2 review. For the AS3, see our Amerisleep AS3 review. If you are looking for the best current discount, check our Amerisleep coupon 2026 page. For the upsell, the AS3 is available at Amerisleep.com.
Pricing and Sizes
| Size | AS1 (list) | AS1 (~30% off) | AS2 (list) | AS3 (list) |
|---|---|---|---|---|
| Twin | $549 | ~$385 | $649 | $849 |
| Twin XL | $649 | ~$455 | $749 | $949 |
| Full | $749 | ~$525 | $849 | $1,149 |
| Queen | $849 | ~$552 | $1,049 | $1,449 |
| King | $1,049 | ~$735 | $1,249 | $1,749 |
| California King | $1,049 | ~$735 | $1,249 | $1,749 |
| Split King | $1,298 (2× TXL) | ~$910 | $1,498 | $1,898 |
Amerisleep’s 30% discount applies automatically at checkout — no coupon code required. The AS1 at ~$552 queen is the entry point for the entire AS lineup, making it one of the more competitive firm all-foam options in this price bracket. Larger holiday sales during Labor Day and Black Friday push discounts to 35–40%. See Amerisleep coupon 2026 for the current live discount status. Do not pay list price.
Who Should Buy the AS1 — and Who Should Skip It
Buy the AS1 if:
- You sleep primarily on your stomach and need the hips elevated to keep the spine aligned — the AS1’s 7/10 firm profile is structurally suited to prone sleeping
- You sleep on your back and consistently prefer a firm, supportive surface rather than contouring feel
- You are a heavier back or stomach sleeper up to 230 lb who sinks too deeply into medium mattresses and wants more pushback
- Budget is a real constraint — at ~$552 queen with 30% off, the AS1 is significantly cheaper than AS2 and AS3 while keeping the same trial and warranty
- You are furnishing a guest room where a firm neutral mattress holds up well for occasional use across varied body types
- You run warm and want the cooling advantage of a thinner foam stack (9.0/10 cooling)
Skip the AS1 if:
- You sleep on your side for any significant portion of the night — the 7.0/10 side pressure score reflects real discomfort that will surface before the 100-night trial ends
- You are a combination sleeper who shifts between back, side, and stomach positions; the AS1 will feel too firm in the side position
- You weigh under 130 lb — lighter sleepers generate less compressive force and will experience the AS1 as very firm with minimal give
- You want adaptive pressure relief with HIVE zoning; the AS1’s Affinity layer lacks the hexagonal cutout pattern that differentiates the AS2 and AS3
- You want a longer trial period; the 100-night window is serviceable but the Saatva Classic at $1,795 includes 365 nights and white-glove delivery
- Your partner is a side sleeper — the AS1 is firm enough that a shared queen will not serve both a stomach and side sleeper well
Frequently Asked Questions
Is the Amerisleep AS1 too firm for most people?
For stomach and back sleepers, no — the AS1’s 7/10 firmness is purpose-built for those positions. For side sleepers, yes. Our testing showed 7.0/10 pressure relief for side sleeping under 200 lb — enough concentrated pressure at the hip and shoulder to cause discomfort over a full night. The AS1 serves a specific audience well and should not be treated as a general-purpose mattress. If you share a bed and sleep positions differ between partners, the AS2 is a more flexible starting point.
How does the AS1 compare to the AS2?
The AS2 is one firmness step softer (medium-firm, 6/10) and one inch taller at 11 inches versus 10 inches for the AS1. Both use Bio-Pur plant foam, but the AS2 includes the Affinity layer with HIVE zoning, giving it better adaptive pressure relief for back sleepers who want some contouring. At 30% off, the AS2 costs ~$130 more than the AS1 queen. If you are a strict stomach sleeper, the AS1 is sufficient. If you sleep on your back and want any lateral softening for combination positions, the AS2 is worth the premium. See our full AS2 review.
Is the Amerisleep AS1 good for back pain?
For back pain related to inadequate lumbar support or anterior pelvic tilt (common in stomach sleepers), yes. The AS1’s firm surface keeps the pelvis level and the lumbar spine in a neutral position. For back pain from a different source — such as side sleepers with hip pressure or combination sleepers needing contouring — the AS1 is not the right choice. If your back pain is from a soft mattress that sags in the middle, the AS1 will almost certainly be an improvement. If it is from pressure on the joints in the lateral position, look at the AS3.
Can stomach sleepers use the Amerisleep AS1?
Yes. The AS1 is one of the better firm all-foam options for stomach sleepers in this price range. The 6-inch Bio-Core dense base prevents hip sinkage, which is the primary concern for prone sleeping. Our stomach sleeper profile at 175 lb showed 9.0/10 pressure relief with no problematic hip dip after 30 nights. Stomach sleepers above 230 lb should note that the AS1 is designed for standard weight ranges; at that weight, the coil core of a hybrid may provide better long-term support without compression creep.
How does Amerisleep AS1 compare to the Saatva Classic Firm?
They are structurally different products. The AS1 is a 10-inch all-foam mattress at ~$552 queen with 30% off. The Saatva Classic Firm is a dual-coil hybrid at $1,795 queen with a 365-night trial, lifetime warranty, and white-glove delivery. The Saatva Firm (7/10) is more supportive for heavier sleepers and has better edge support for couples. The AS1 has better motion isolation and is significantly cheaper. For light-to-moderate body weight stomach or back sleepers on a budget, the AS1 competes well. For heavier sleepers or couples, the Saatva Classic is worth the price difference. See our Amerisleep vs Saatva comparison.
Does the AS1 sleep hot?
No — it is the coolest-running model in the all-foam AS lineup. The 10-inch stack has less insulating foam mass than deeper models, allowing body heat to dissipate faster. Bio-Pur’s open-cell structure also runs cooler than conventional closed-cell memory foam. Our 8-hour heat-pad test recorded a 9.0/10 cooling score. This is one area where the AS1’s thin construction is genuinely advantageous for warm sleepers who prefer a firm mattress.
What is the AS1 sleep trial?
100 nights. Amerisleep requires a minimum of 30 nights on the mattress before a return can be initiated (the break-in period). If you return it within the trial window, Amerisleep arranges free pickup and issues a full refund with no restocking fee. The 100-night trial is shorter than Saatva (365 nights) and Awara (365 nights) but standard for the direct-to-consumer foam mattress segment. Use the full 30-day minimum before deciding — firm mattresses can feel very stiff in the first one to two weeks before the foam adjusts to body weight.
Is the 20-year Amerisleep warranty worth noting?
The 20-year warranty covers manufacturing defects including sagging over 0.75 inches. Amerisleep will repair or replace the mattress at no charge for covered defects during the warranty period. The warranty is non-prorated for the full 20 years, which is above average — many competing brands prorate coverage after year 10. Using the mattress on an unsupported foundation (slats wider than 3 inches, for example) will void the warranty. Keep the receipt and setup photos in case you need to file a claim.
Does Amerisleep offer a discount on the AS1?
Yes. Amerisleep’s 30% site-wide discount auto-applies at checkout on the AS1 with no coupon code required. The queen drops from $849 to approximately $552. Holiday sales during Labor Day and Black Friday push discounts to 35–40%. Any coupon code you find on third-party sites will not stack with the auto-applied discount. Check Amerisleep coupon 2026 for the current discount status and upcoming sale dates.
What foundation does the AS1 need?
The AS1 is compatible with platform frames, slatted frames (slats no more than 3 inches apart), box springs, and adjustable bases. Slats wider than 3 inches can cause the foam to deform over time and will void the 20-year warranty. A box spring adds height to the overall sleep setup — the AS1 at 10 inches is shorter than most mattresses, so pairing it with a low-profile platform frame is a common choice. Amerisleep sells its own adjustable base with a bundle discount when purchased simultaneously with the mattress.
Verdict
AS1: 8.0/10 — Best firm all-foam for stomach and back sleepers on a budget.
After 30 nights of structured testing, the Amerisleep AS1 is a well-built mattress for a specific and underserved audience: confirmed stomach and back sleepers who want firm support, Bio-Pur plant-based comfort foam, and the lowest entry price in the AS lineup. The 7/10 firmness keeps hips level in the prone position, the 9.0/10 cooling performance is the best in the AS all-foam range, and the 8.5/10 motion isolation makes it a reasonable option for couples where both partners sleep on their backs or stomachs.
The limitation is firm and clear: the AS1 does not work for side sleepers. The 7.0/10 side pressure score reflects real shoulder and hip pressure that no amount of break-in time will resolve for sleepers under 200 lb in the lateral position. If you spend any meaningful portion of the night on your side, look at the AS2 for a firmer option or the AS3 for full HIVE-zoned pressure relief.
At ~$552 queen with 30% off, the AS1 is approximately $463 less than the AS3 at the same discount tier. That gap is meaningful. If your sleep position genuinely matches the AS1’s target profile, you are not getting a lesser mattress — you are getting the right mattress at a lower price. Buy the AS3 only if your sleep positions require its wider coverage.
Amerisleep AS1 — Firm 7/10 All-Foam
Bio-Pur plant foam + Affinity transition + 6” Bio-Core base. 9.0/10 cooling, 8.5/10 motion isolation. ~$552 queen with 30% off auto-applied. 100-night trial, 20-year warranty.