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 $949 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 in our ratings
- Bio-Pur partially plant-based foam, CertiPUR-US certified
- Twin XL $649 on sale ($1,149 regular); Queen currently out of stock
- 365-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, it scores 9.0/10 for cooling in our ratings, 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 in our ratings
- 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; 365-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. 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 | 365 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 |
Our Ratings
These are MattressNut's editorial ratings, based on the AS1's construction, Amerisleep's specifications and comparison with the rest of the lineup. They are not results from our own lab tests, and we have no independent lab data for the AS1.
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. The firm base also keeps the lumbar supported for back sleepers, 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. Side sleepers put most of their weight on the hip and shoulder, and a firm surface pushes back hard at those points. 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 pressure buildup that, over a full night, can 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)
A 10-inch foam stack has less insulating mass than the 12-inch AS3, though we have no lab data for the AS1; for reference, NapLab measured peak surface temperatures of 85.4°F on the AS3 and 89.8°F on the AS2. 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. NapLab measured 5.5 inches of sitting compression on the AS3, and the AS1's firmer build should hold the edge somewhat better. 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. All-foam beds typically transfer far less motion than innersprings. 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 in our ratings
- 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, which Amerisleep says is less likely to off-gas
- Durable in guest rooms and low-use settings due to firm density
- Same 365-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
- 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 | 365 nights | 20 years | Out of stock (Twin XL $649 on sale) |
| Amerisleep AS2 | All-foam Bio-Pur | Med-firm 6/10 | 365 nights | 20 years | $949 sale ($1,549 regular) |
| Amerisleep AS3 | All-foam Bio-Pur + HIVE | Medium 5/10 | 365 nights | 20 years | $1,149 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 $949 on sale, $1,549 regular) and the AS3 (queen $1,149 on sale, $1,749 regular).
Amerisleep currently offers $600 off the AS2, AS3, AS5 and Organica with code BFCM through December 9. This offer does not cover the AS1. 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. We rate it 7.0/10 for side-sleeper pressure relief 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 two inches taller at 12 inches. Both use Bio-Pur foam, but the AS2 includes HIVE zoning in the Affinity layer for adaptive pressure relief. The AS2 queen is $949 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?
The firm feel may suit some back or stomach sleepers; talk to your doctor about back pain and positioning. 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. We rate it 9.0/10 for back and stomach pressure relief.
Does the AS1 sleep hot?
It should not, though we have no lab data for the AS1. 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. We rate it 9.0/10 for cooling.
What is the AS1 sleep trial?
365 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?
Partly. 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 a foundation with slats more than 2.75 inches apart can void the warranty.
Verdict
AS1: 8.0/10, Best firm all-foam for stomach and back sleepers on a budget.
In our ratings, 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, it scores 9.0/10 for cooling, 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 firm feel may be less comfortable at the shoulders and hips for side sleepers, depending on individual fit. If you spend any meaningful portion of the night on your side, look at the AS2 or the AS3.
The AS3 queen is $1,149 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. 365-night trial, 20-year warranty.