by The Amerisleep AS1 is out of Amerisleep’s main lineup: amerisleep.com still lists the Twin XL ($649 on sale), California King and Split King. For other sizes, compare the medium-firm AS2, at $1,049 queen on sale ($1,549 regular). It is built for confirmed stomach and back sleepers. Side sleepers should look at the AS2 or AS3 instead.
#1 Best Overall
Amerisleep AS1
8.0/10
- Firmest in the AS lineup, keeps hips level for stomach sleepers
- 9.0/10 cooling, thin 10” foam stack dissipates heat faster than deeper models
- Bio-Pur partially plant-based foam, CertiPUR-US certified
- Twin XL $649 on sale ($1,149 regular); Queen currently out of stock
- 100-night trial, 20-year warranty
- Too firm for side sleepers under 200 lb, expect shoulder and hip pressure
- No HIVE zoning in the transition layer (unlike AS2/AS3)
- Ships compressed in a box, no white-glove delivery option
For confirmed stomach and back sleepers who prefer a firm surface, the AS1 is the sharpest value in the entire AS lineup. The 7/10 firm profile keeps the hips level in the prone position, the 9.0/10 cooling is the best in the AS all-foam range, with Twin XL, California King and Split King still in stock on amerisleep.com.
Amerisleep AS1, Overall Score: 8.0/10
- Firmness: 7/10, firmest in the AS lineup, suited to back and stomach sleepers
- Cooling: 9.0/10, thin 10” stack lets heat dissipate faster than deeper models
- Edge support: 8.2/10, high-density Bio-Core base holds the perimeter well
- Motion isolation: 8.5/10, all-foam construction absorbs movement effectively
- Pressure relief (side): 7.0/10, too firm for side sleepers under 200 lb
- Compare current AS1 and AS2 prices at list; 100-night trial and 20-year warranty match the full AS lineup
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 sleepers who do not need deep compression or multiple comfort transitions.
Total stack: 2” + 2” + 6” = 10”. Less foam depth means less insulating mass, contributing to the 9.0/10 cooling score. For back and stomach sleepers who do not need deep pressure relief, the thin construction is a feature rather than a limitation.
Full Specs
| Spec | Details |
|---|---|
| Total height | 10”, shortest in the AS lineup |
| Comfort layer | Bio-Pur partially plant-based memory foam, 2” |
| Transition layer | Affinity foam, 2” (no HIVE zoning on AS1) |
| Support base | Bio-Core high-density polyfoam, 6” |
| Firmness | Firm, 7/10, firmest in the AS lineup |
| Firmness options | 1 (Firm only) |
| Trial period | 100 nights |
| Warranty | 20 years: full replacement years 1–10, then replacement at 50% of the original price in years 11–20 |
| Delivery | Free ground shipping, compressed in a box |
| Certifications | CertiPUR-US certified foams |
| Best for | Stomach sleepers, firm-preference back sleepers, 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 profiles are the primary audience; the side sleeper profile was included specifically to document where the AS1 falls short. All testing was 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 the 15-day and 30-day marks.
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. Back sleepers at 200 lb showed consistent lumbar support without 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. The AS3 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. A 10-inch foam stack has less insulating mass than the 12-inch AS3. 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. For back and stomach sleepers who run warm, the AS1’s cooling 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 than the AS3 all-foam at 1.9 inches, reflecting the firmer construction. It is not at the level of a pocketed coil edge (the AS3 Hybrid scores 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% lower amplitude than a standard innerspring. For couples sharing the AS1, normal nighttime movement will not significantly disturb a sleeping partner.
Pros and Cons
AS1: Pros
- Twin XL $649 on sale ($1,149 regular); Queen currently out of stock
- 9.0/10 cooling, thin 10” stack runs cooler than deeper AS foam models
- 9.0/10 pressure relief for back and stomach sleepers
- 8.5/10 motion isolation, all-foam absorbs movement well
- 8.2/10 edge support, high-density Bio-Core base holds the perimeter
- Bio-Pur partially plant-based foam, lower VOC off-gassing than conventional memory foam
- Durable in guest rooms and low-use settings 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, expect shoulder and hip pressure
- No HIVE zoning in the Affinity layer, misses the adaptive softening of AS2/AS3
- Firm-only limits the audience; other models such as AS3 also have a single feel
- 100-night trial is shorter than Saatva (365 nights) or Awara (365 nights)
- Ships compressed in a box, no white-glove delivery option
→ Check Today’s Amerisleep AS1 Price
AS1 vs AS2 vs AS3
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.
| Mattress | Type | Firmness | Trial | Warranty | Queen price |
|---|---|---|---|---|---|
| Amerisleep AS1 | All-foam Bio-Pur | Firm 7/10 | 100 nights | 20 years | Out of stock (Twin XL $649 on sale) |
| Amerisleep AS2 | All-foam Bio-Pur | Med-firm 6/10 | 100 nights | 20 years | $1,049 sale ($1,549 regular) |
| Amerisleep AS3 | All-foam Bio-Pur + HIVE | Medium 5/10 | 100 nights | 20 years | $1,249 sale ($1,749 regular) |
For a full breakdown of the AS2, see our Amerisleep AS2 review. For the AS3, see our Amerisleep AS3 review. For the current discount status, check our Amerisleep coupon 2026 page.
Pricing and Sizes
The AS1 is out of Amerisleep’s main lineup. On October 20, 2026, amerisleep.com still listed three sizes in stock: Twin XL $649 on sale ($1,149 regular), California King $1,149 ($1,649) and Split King $1,348 ($1,848); Twin, Full, Queen and King were out of stock. The closest current models are the medium-firm AS2 (queen $1,049 on sale, $1,549 regular) and the AS3 (queen $1,249 on sale, $1,749 regular).
Amerisleep currently offers $500 off any mattress with code AS500. Check event pricing on amerisleep.com when each sale starts. See Amerisleep coupon 2026 for 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
- You sleep on your back and consistently prefer a firm, supportive surface over contouring feel
- You are a heavier back or stomach sleeper up to 230 lb who sinks too deeply into medium mattresses
- Budget is a real constraint: compare the AS1 current price with the AS2 and AS3 before buying
- You are furnishing a guest room where a firm mattress holds up for occasional use across varied body types
- You run warm and want the cooling advantage of a thinner foam stack
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
- You are a combination sleeper who shifts between back, side, and stomach positions
- You weigh under 130 lb, lighter sleepers will experience the AS1 as very firm with minimal give
- You want HIVE zoning adaptive pressure relief, the AS1’s Affinity layer lacks the hexagonal pattern
- Your partner is a side sleeper sharing the same queen
Frequently Asked Questions
Is the Amerisleep AS1 too firm for most people?
For stomach and back sleepers, no, the 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, with concentrated pressure at the hip and shoulder. The AS1 is not a general-purpose mattress.
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. Both use Bio-Pur foam, but the AS2 includes HIVE zoning in the Affinity layer for adaptive pressure relief. The AS2 queen is $1,049 on sale ($1,549 regular); check the AS1 current price before comparing. 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 firm surface keeps the pelvis level and the lumbar spine in a neutral position. For back pain from side-position joint pressure, the AS1 is not the right choice, 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 base prevents hip sinkage, which is the primary concern for prone sleeping. Our 175 lb stomach sleeper profile showed 9.0/10 pressure relief with no hip dip after 30 nights.
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 mass than deeper models, and Bio-Pur’s open-cell structure dissipates heat faster than conventional closed-cell memory foam. Our 8-hour heat-pad test scored 9.0/10.
What is the AS1 sleep trial?
100 nights. Amerisleep requires a minimum of 30 nights before a return can be initiated. If returned within the trial window, Amerisleep arranges free pickup and issues a full refund with no restocking fee. Use the full 30-day minimum before deciding, firm mattresses can feel very stiff in the first week or two before the foam adjusts to body weight.
How does the AS1 compare to the Saatva Classic Firm?
They are structurally different products. The AS1 is a 10-inch all-foam with current pricing on amerisleep.com. The Saatva Classic Firm is a dual-coil hybrid at $2,229 queen with a 365-night trial, lifetime warranty, and white-glove delivery. The Saatva is more supportive for heavier sleepers and has better edge support for couples. The AS1 has better motion isolation and is significantly cheaper. See our Amerisleep vs Saatva comparison.
Is the 20-year Amerisleep warranty non-prorated?
Yes. The 20-year warranty covers manufacturing defects and sagging more than 1.5 inches, with full replacement in years 1–10 and prorated coverage thereafter. Using the mattress on a foundation with slats wider than 3 inches will void the warranty.
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 audience: confirmed stomach and back sleepers who want firm support, Bio-Pur 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 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 back or stomach.
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 discomfort that no 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 or the AS3.
The AS3 queen is $1,249 on sale ($1,749 regular). AS1 Twin XL is $649 on sale ($1,149 regular); only a few sizes are left. Choose the firmness that matches your sleep position.
Final pick
Amerisleep AS1
8.0/10
Firm 7/10 all-foam. Bio-Pur partially plant-based comfort layer, Affinity transition foam, 6” Bio-Core base. 9.0/10 cooling, 8.5/10 motion isolation. Twin XL $649 on sale ($1,149 regular); Queen out of stock. 100-night trial, 20-year warranty.