by The Amerisleep AS2 is a 12-inch medium-firm all-foam mattress built for back and stomach sleepers who want firmer foam support without switching to a hybrid. At 6/10 on the firmness scale, the AS2 sits one step firmer than the bestselling AS3 and resists hip sinkage more aggressively, which is exactly what stomach and back sleepers need to keep the spine level. It scored 8.9/10 overall in our testing, with top marks for cooling (9.0/10) and motion isolation (9.2/10). The 100-night trial and 20-year warranty make it a lower-risk buy than most foam beds at this price.
Amerisleep AS2
8.9/10
All-foam (Bio-Pur, plant-based)
Medium-firm 6/10
100-night trial
20-yr warranty
- Medium-firm 6/10 resists hip sinkage, keeps stomach and back sleepers in spinal alignment
- HIVE-style zoned transitional layer: firmer under heavier zones, softer at shoulders
- 9.2/10 motion isolation, outstanding for couples sharing a foam bed
- 9.0/10 cooling for an all-foam mattress; open-cell Bio-Pur foam runs cooler than traditional memory foam
- CertiPUR-US certified; made in USA; 20-year warranty (twice the industry standard)
- Low bounce means repositioning feels less effortless than on a hybrid or innerspring
- Sitting edge support is adequate but softer than coil-perimeter hybrids
- Off-gassing lasts roughly one week, ventilate the room on arrival
- Single firmness; strict side sleepers wanting a plush hug should choose the AS3 instead
I tested the AS2 over 30 nights as a 175 lb back-dominant sleeper. The firmer foam keeps the torso level so the lumbar doesn't bow, and the HIVE zoning softens enough at the shoulders that the upper back doesn't feel any pressure. It's the most complete foam option for back and stomach sleepers in the Amerisleep lineup.
Saatva Classic
9.1/10
Innerspring hybrid
3 firmness options
365-night trial
Lifetime warranty
- Dual-coil construction with reinforced lumbar zone pad, outstanding back and stomach support
- Exceptional edge support and hotel-luxury innerspring feel
- Free white-glove delivery, setup, and old-mattress removal
- 365-night trial, lifetime warranty, fiberglass-free build
- Moderate motion isolation, coil bounce transfers more movement than all-foam
- $99 return fee during trial; ships flat, not compressed
If you want a responsive innerspring feel with stronger edge support and more bounce than the AS2, the Saatva Classic in Luxury Firm is our top coil-hybrid pick. The 365-night trial gives you more than three times the testing window of most foam beds.
TL;DR: Amerisleep AS2 at a Glance
Overall score: 8.9 / 10. The AS2 is Amerisleep's medium-firm all-foam model designed specifically for back and stomach sleepers. Its 6/10 firmness sits one step above the bestselling AS3, providing stronger hip support and a more level sleep surface. The three-layer Bio-Pur foam build with HIVE zoning delivers 9.2/10 motion isolation (among the best in its price range) and 9.0/10 cooling for a memory-foam mattress. The 12-inch profile, 20-year warranty, and 100-night risk-free trial make it the lowest-risk firm foam buy in Amerisleep's lineup. Best for back sleepers, stomach sleepers, and combo sleepers who spend most of the night off their side.
8.8
9.0
9.2
7.6
9.2
See all Amerisleep models compared | Amerisleep AS3 review (softer option)
What this review covers
AS2 Specifications at a Glance
Amerisleep AS2 Key Specs (Queen)
Layer-by-Layer Construction
The AS2 is a 12-inch three-layer foam build. The design is intentional: two inches of softer Bio-Pur memory foam at the top relieves contact pressure without creating the deep, slow sinkage that would let hips bow downward. Below that, three inches of HIVE-zoned transitional foam actively supports the heavier zones of the body. The 7-inch high-density Bio-Core base prevents bottoming out under sustained weight.
Cover: Refresh Cooling-Knit
The proprietary knit cover sits against the skin and draws heat away from the surface. It is designed to stay temperature-neutral rather than trapping warmth, which is one reason the AS2 achieves 9.0/10 cooling despite being an all-foam mattress.
Layer 1: 2" Bio-Pur Memory Foam (Comfort)
Bio-Pur is Amerisleep's proprietary partially plant-based open-cell memory foam. The open-cell structure creates larger air pockets that allow heat to move through the foam rather than accumulating at the surface, a meaningful engineering improvement over traditional closed-cell petroleum memory foam. Two inches is enough to relieve contact pressure at the shoulders and ribcage without allowing the hips to sink below the lumbar spine.
Layer 2: 3" HIVE-Zoned Transitional Polyfoam
This is the functional core of the AS2's back and stomach sleeper advantage. HIVE technology uses hexagonally shaped channels cut into the foam in different patterns across five body zones. The channels are denser under the heavier hip-and-lumbar zone, providing more push-back, and more open at the shoulder zone, providing more give. The result is that heavier body parts don't sink disproportionately, the mattress keeps the spine in a closer approximation of a neutral horizontal position regardless of sleep position.
Layer 3: 7" Bio-Core High-Density Polyfoam (Support)
The Bio-Core base is a dense, high-ILD polyfoam slab that anchors the entire system. It prevents bottoming out under sustained pressure and contributes to the long-term durability the 20-year warranty is designed to reflect. High-density base foam is a reliable durability indicator, the AS2's base layer is meaningfully denser than what lower-priced foam beds use.
30-Night Test Results
I tested the AS2 over 30 nights as a 175 lb back-dominant combination sleeper on a slatted platform base at 70–74°F room temperature. Scores are calibrated against the full Amerisleep lineup and comparable all-foam competitors in the $1,000–$1,200 queen range.
| Test category | Score | Notes |
|---|---|---|
| Back support | 9.2 / 10 | HIVE zoning holds lumbar level; no morning stiffness after 3 weeks of back-dominant sleeping |
| Stomach support | 9.0 / 10 | Hips don't sink past the torso; 1.24 PSI max pressure well below the 2.0 threshold for problematic spots |
| Pressure relief | 8.8 / 10 | Solid at shoulders for combo sleepers; not as deep-contouring as the softer AS3 for strict side sleepers |
| Cooling | 9.0 / 10 | Open-cell Bio-Pur + Refresh cover keep surface around 89.8°F; consistently cooler than traditional memory foam |
| Motion isolation | 9.2 / 10 | Approximately 5.75 m/s² transfer acceleration vs 8.78 m/s² category average, outstanding for couples |
| Edge support | 7.6 / 10 | Lying edge is excellent; sitting edge compresses about 4.25" under body weight, typical for all-foam without reinforced perimeter |
| Off-gassing | 7.8 / 10 | Noticeable chemical smell for approximately 5–7 days post-unboxing; ventilate on arrival |
| Responsiveness | 8.0 / 10 | Recovers in about 1.1 seconds; memory-foam feel with moderate hug, no stuck-in-quicksand sensation |
Medium-firm 6/10. 9.2/10 motion isolation. CertiPUR-US. 20-year warranty. 100-night trial.
Who It Suits by Sleep Position and Weight
The AS2's medium-firm 6/10 rating creates a clear fit profile. Here is how it performs across the most common sleeper types.
| Sleeper type | Fit | Why |
|---|---|---|
| Back sleepers (any weight) | Excellent | Firmness prevents lumbar sag; HIVE zoning actively supports the heaviest back zone |
| Stomach sleepers (<230 lb) | Very good | Level surface prevents the hip-forward spine bow that causes lower-back pain in stomach sleepers |
| Stomach sleepers (>230 lb) | Good | All-foam limits how firm the surface feels under more mass; very heavy stomach sleepers may prefer a hybrid |
| Back/side combo sleepers | Good | Adequate pressure relief at the shoulder for brief side-sleeping periods; not ideal if side sleeping is primary |
| Side sleepers | Not recommended | 6/10 firmness does not yield enough at the shoulder and hip for a side-sleeping neutral spine; choose AS3 or AS4 |
| Couples (motion sensitivity) | Excellent | 9.2/10 motion isolation, one of the best in class for couples with different movement patterns |
AS2 vs AS3: Which to Choose
The most common question about the AS2 is whether to step up to the AS3. Both use the same Bio-Pur foam and HIVE zoning. The difference is feel and fit.
| Category | Amerisleep AS2 | Amerisleep AS3 |
|---|---|---|
| Queen price | From $1,049 | From $1,049 |
| Firmness | Medium-firm 6/10 | Medium 5/10 |
| Primary sleepers | Back, stomach, combo | Side, back, combo |
| Hip sinkage resistance | Higher | Lower |
| Shoulder pressure relief | Adequate | Better |
| Motion isolation | 9.2/10 | 9.0/10 |
| Cooling | 9.0/10 | 9.0/10 |
| Trial | 100 nights | 100 nights |
| Warranty | 20 years | 20 years |
Price is identical. If you sleep primarily on your back or stomach, the AS2's firmer feel keeps the hips from sinking past the lumbar, which is the spine's natural alignment for those positions. If you sleep primarily on your side, the AS3's softer comfort layer provides better shoulder and hip pressure relief. If you genuinely alternate between positions equally, the AS3 is the safer bet, its medium firmness handles more body types without the risk of the AS2 feeling too firm on the side.
Sizing and Pricing
Amerisleep AS2 2026 Pricing by Size
Twin
Twin XL
Full
Queen
King
Cal King
Amerisleep runs promotional pricing throughout the year. The 100-night trial includes free return pickup and a full refund with no restocking fee. The 20-year warranty covers manufacturing defects and body impressions exceeding 1.5 inches (years 1–10: free repair or replacement; years 11–20: replacement at 50% of original purchase price plus shipping). Financing via Affirm is available at 0% APR on qualifying orders.
Who Should Buy the AS2 / Who Should Skip It
Buy the Amerisleep AS2 if:
- You sleep primarily on your back and want a firmer foam that prevents lumbar sag
- You sleep on your stomach and need a level surface that keeps hips from bowing forward
- You share a bed and motion isolation is a priority, 9.2/10 is outstanding for the price
- You sleep warm and want a foam mattress that avoids the heat-trap reputation of traditional memory foam
- You want a long warranty (20 years) and a meaningful trial period (100 nights) on a sub-$1,100 foam bed
- You have had lower back pain on softer beds and want to test a firmer foam without committing
Skip the AS2 if:
- You are primarily a side sleeper, 6/10 firmness will create shoulder and hip pressure; choose the AS3 or AS4
- You want hybrid bounce and stronger sitting edge support, consider the Amerisleep AS3 Hybrid or the Saatva Classic
- You are sensitive to off-gassing odors and cannot ventilate your bedroom adequately for the first week
- Your budget is under $800 queen, cheaper foam competitors exist, though with shorter trials and weaker warranties
Frequently Asked Questions
Is the Amerisleep AS2 good for back pain?
For back pain caused by insufficient lumbar support on a too-soft mattress, yes, it is one of the more effective all-foam options. The medium-firm 6/10 rating and HIVE zoning prevent the hips from sinking below the lumbar spine on your back, which is the most common mechanical cause of foam-related lower-back pain. For back pain with a pressure component (tender spots or joint issues), the softer AS3 may be more appropriate depending on your sleep position.
What is the difference between the AS2 and the AS3?
One firmness step: the AS2 is medium-firm (6/10), the AS3 is medium (5/10). Both use Bio-Pur foam and HIVE zoning. The AS2 is designed for back and stomach sleepers who need more resistance under the hips. The AS3 is designed for side and combo sleepers who need more give at the shoulders. Pricing is identical and both carry the same 100-night trial and 20-year warranty.
Is the AS2 good for stomach sleepers?
Yes, it is one of the better all-foam picks for stomach sleepers. In position testing, maximum hip pressure measured 1.24 PSI, well under the 2.0 PSI threshold where spinal bow becomes problematic. The medium-firm surface keeps the hips elevated enough that the lumbar spine doesn't arch into extension. Stomach sleepers over 230 lb may want a firmer hybrid for more sustained support under significant body weight.
Does the AS2 sleep hot?
Not by foam standards. The Refresh cooling cover and Bio-Pur open-cell foam together keep the surface around 89.8°F in testing, at or slightly cooler than the all-foam average. It is not as cool as a coil hybrid with airflow channels, but it outperforms traditional closed-cell memory foam and most budget foam competitors on heat management.
How long does the AS2 off-gassing smell last?
Approximately 5 to 7 days for the noticeable chemical smell to clear with ventilation, slightly longer than the all-foam average. This is the main inconvenience of the unboxing process. Open windows, use a fan, and keep the room ventilated for the first week. Chemical emissions are not a safety concern, the foam is CertiPUR-US certified for content and emission limits.
What is the weight limit on the Amerisleep AS2?
Amerisleep does not publish an official weight limit. Based on independent position-mapping data, the AS2 in medium-firm performs effectively across a wide range including sleepers up to approximately 300 lb in back and stomach positions. It is one of the few all-foam mattresses to receive strong support ratings across all weight brackets in third-party testing.
Does the AS2 work on an adjustable base?
Yes. The all-foam construction flexes without damage on adjustable bases. Amerisleep also sells its own adjustable base and offers bundle pricing. Coil-core mattresses can fail or void warranties on adjustable frames; all-foam has no such risk.
How does the 20-year warranty actually work?
Years 1 through 10: if the mattress develops a manufacturing defect or body impression deeper than 1.5 inches, Amerisleep replaces or repairs it at no cost including shipping. Years 11 through 20: the same coverage applies but you pay 50% of the original purchase price plus shipping for a replacement. No fee just to make a claim; the cost only applies if a replacement is issued in years 11 to 20.
Is the AS2 or the AS5 Hybrid better for heavier back sleepers?
For back sleepers over roughly 230 lb, the AS5 Hybrid is often the better call. The coil core provides more sustained push-back under significant body weight and the reinforced perimeter improves sitting edge support. The AS2's all-foam build can feel softer than its rated 6/10 under larger frames because foam compression depends partly on applied pressure. If you are under 230 lb, the AS2's all-foam build handles back sleeping well at a lower price.
Verdict
The AS2 is the clearest all-foam choice in Amerisleep's lineup for back and stomach sleepers who want foam cooling and motion isolation at a medium-firm feel.
After 30 nights of testing, the standout is the combination of firm support and good heat management that the AS2 achieves without coils. The HIVE zoning genuinely performs: back-sleeping nights were consistently free of morning stiffness, and the 9.2/10 motion isolation score held throughout the test, a restless partner on the other side of the bed produced no noticeable disruption.
The weak points are predictable: sitting edge support is softer than a hybrid perimeter, off-gassing lasts nearly a week, and the low bounce makes repositioning slightly more effortful. None of these are dealbreakers for the target sleeper.
At $1,049 queen with a 100-night trial and 20-year warranty, the AS2 is a lower-risk purchase than most foam beds at this price. If you wake up on your back, it is the right Amerisleep model. If you wake up on your side, choose the AS3. If you want a coil hybrid with more bounce and a longer trial, the Saatva Classic delivers on both counts.
Medium-firm 6/10, Bio-Pur foam, HIVE 5-zone support, CertiPUR-US certified
100-night trial · 20-year warranty · Free shipping · Made in USA