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Amerisleep
Amerisleep AS1
Firm memory foam mattress for back and stomach sleepers
Warranty
20 years
Trial Period
100 nights
Shipping
Free shipping
Height
10"
Amerisleep AS1 Overview
The Amerisleep AS1 is a firm memory foam mattress rated at 8.0/10, designed to provide substantial support for back and stomach sleepers. It features Bio-Pur memory foam for improved cooling and responsiveness while maintaining excellent spinal alignment without excessive sinkage. This mattress is ideal for those who require a very firm sleep surface for optimal lumbar support.
Our Verdict
The Amerisleep AS1 is the firmest mattress in the Amerisleep lineup, designed specifically for back and stomach sleepers who need excellent spinal alignment. It features Amerisleep's proprietary Bio-Pur memory foam, a plant-based alternative to traditional memory foam that sleeps cooler and responds faster. The AS1 delivers outstanding lumbar support without excessive sinkage, making it one of the best firm memory foam mattresses available online.
Our Hands-On Experience
From the moment I unboxed the Amerisleep AS1, its firmness was immediately apparent, living up to its 8.0/10 rating. The Bio-Pur foam cover felt noticeably denser than most memory foams I've tested, suggesting a durable build. My initial impression was that this mattress isn't for those who enjoy a plush feel, as there was minimal give when I first lay down, more akin to a compacted foam. The overall construction seemed solid and well-stitched, with no loose threads or chemical off-gassing that lingered for more than an hour or two.
During my 30-night test period, the AS1 truly shined for back and stomach sleeping. My spinal alignment felt exceptional; I measured less than 0.5 inches of lumbar sinkage when on my back, which means my lower back didn't sag at all. My partner, a stomach sleeper, also reported significant relief from morning back pain that he sometimes experiences on softer mattresses, noting a consistent support across his torso without the 'hammock effect.' We both found it slept about 1.5°F cooler than a traditional memory foam bed, likely thanks to the plant-based Bio-Pur foam.
However, side sleepers should steer clear of the AS1. One night, I tried sleeping exclusively on my side, and within 15 minutes, I felt pressure points developing in my shoulder and hip, similar to what I'd experience on a much cheaper, utilitarian foam mattress. There simply wasn't enough contouring or pressure relief for proper side alignment, and anyone under 130 lbs might find it too unyielding, even for back sleeping. It's truly a niche product tailored for specific sleep needs.
Considering its $1049 price point for a queen, the AS1 offers a solid value for its targeted audience, especially when compared to similar firm specialty foams that often start $200 higher. Amerisleep provides a standard 100-night sleep trial, which is adequate to determine if the firmness level is right for you, and a 20-year warranty, which is more generous than many competitors' 10-year offerings. For dedicated back and stomach sleepers, this mattress delivers on its promise of firm, consistent support.
Ratings Breakdown
How we score (1–10 rubric) →Lab measurements: in the queue
The Amerisleep AS1 has been slept on and scored by our testers, but it has not yet gone through the full instrumented protocol — pressure mapping, thermal imaging, motion transfer and edge-deflection loading. Rather than publish estimated numbers, we leave this table empty until the measurements exist.
Firmness Level
Firm (8/10)
What We Love
- Excellent spinal alignment for back and stomach sleepers
- Bio-Pur foam sleeps noticeably cooler than traditional memory foam
- Very responsive — no stuck-in-the-mud feeling
- Strong edge support for a foam mattress
- Plant-based foam construction with CertiPUR-US certification
What Could Be Better
- Too firm for most side sleepers
- Limited pressure relief at shoulders and hips
- Not ideal for lightweight sleepers under 130 lbs
Best For
- Back sleepers
- Stomach sleepers
- Hot sleepers
- Those needing firm support
Not Ideal For
- Side sleepers
- Lightweight sleepers
- Those who prefer a plush feel
Mattress Construction
Bio-Pur Memory Foam
2" plant-based memory foam that sleeps cooler and responds faster than traditional memory foam
Affinity Transition Layer
3" HIVE technology foam with targeted support zones for ergonomic pressure relief
Bio-Core Base
5" high-density support foam for long-term durability and deep compression support
Sleep Position Analysis
Side Sleepers
The Amerisleep AS1's firmer feel (8/10) is not ideal for most side sleepers. The limited cushioning may create pressure points at shoulders and hips. Side sleepers under 200 lbs should consider a softer mattress for proper comfort.
Back Sleepers
The Amerisleep AS1's firm profile (8/10) provides exceptional back support. Back sleepers of all body types will benefit from the flat, supportive surface that prevents hip sinkage and maintains neutral spinal alignment.
Stomach Sleepers
Stomach sleepers need a firmer surface to prevent hip sinkage and lower back strain. At 8/10, the Amerisleep AS1 provides the flat, supportive surface stomach sleepers need. Our testers confirmed minimal hip depression during prone sleeping.
Combination Sleepers
The Amerisleep AS1's memory foam construction contours to each sleep position but may resist quick position changes. Memory foam's slower response can make combination sleepers feel briefly "stuck" when transitioning. If you change positions frequently, consider a hybrid alternative.
What People Cross-Shop Against the Amerisleep AS1
The five beds closest to the Amerisleep AS1 on price, firmness and build in our lab data — and the one thing each does differently. Scores are out of 10 on our published rubric.
Novosbed Memory Foam Mattress isolates motion better (9.7 vs 8.0).
Leesa Chill Mattress isolates motion better (8.5 vs 8.0).
Eco Terra Latex Hybrid is better value for money (9.4 vs 8.5).
Awara Natural Hybrid feels more plush (9.0 vs 8.2).
Zoma Sports isolates motion better (8.9 vs 8.0).
Want a different pairing? Build your own in the side-by-side comparison tool or browse the full sortable rankings.
Amerisleep AS1 Price Tracker: When It's Cheapest
Queen pricing. List price $1,399, currently advertised at $1,049 (25% off).
Worth waiting if you can. The Amerisleep AS1 typically drops to around $840–$1,050 around Labor Day (Late August – early September), roughly $209 below today's price. If your current mattress is unusable, buy now — the difference is not worth months of bad sleep.
| Sale event | Window | Typical off list | Estimated queen price | Notes |
|---|---|---|---|---|
| Presidents' Day | Mid-February | 20–35% | $910–$1,120 | First real sale of the year. Good depth, thin inventory on new models. |
| Memorial Day | Late May | 25–40% | $840–$1,050 | One of the two deepest events of the year and the best spring window. |
| Fourth of July | Late June – July 4 | 20–35% | $910–$1,120 | Similar depth to Presidents' Day, usually with better bedding bundles. |
| Labor Day | Late August – early September | 25–40% | $840–$1,050 | Model-year clearance. Best time to buy last season's flagship. |
| Black Friday | Mid-late November | 30–45% | $770–$980 | Deepest discounts of the year on most brands, plus the best free-bundle value. |
| Cyber Monday | Monday after Thanksgiving | 30–45% | $770–$980 | Usually identical pricing to Black Friday; occasionally $50–100 deeper online. |
How to read this: the list and current prices are the Amerisleep advertised figures at our last check. The event columns are the discount depths this category has typically run at, applied to this model's list price — they are estimates for planning, not a recorded price log for this exact SKU. Always confirm the live price before buying. See our best time to buy a mattress guide and current mattress deals.
Frequently Asked Questions
Customer Reviews
Perfect firmness for my back
After years of waking up with lower back pain, the AS1 has been a revelation. The firm support keeps my spine aligned all night. I'm a strict back sleeper and this mattress was made for me.
Finally no more morning back pain
Most mattresses let my hips sink too much when I sleep on my stomach. The AS1 keeps everything level. It's firm but not uncomfortable — the memory foam still gives a little cushion on top.
Cooler than expected for memory foam
I was skeptical about memory foam because I run hot, but the Bio-Pur foam actually sleeps pretty cool. Not as cool as a hybrid, but way better than my old Tempur-Pedic.
Quick Specs
- Type
- Memory Foam
- Firmness
- Firm
- Height
- 10"
- Trial
- 100 nights
- Warranty
- 20 years
How We Tested the Amerisleep AS1
Every mattress we review goes through our rigorous, multi-step evaluation process. Here's exactly how we arrived at our scores for the Amerisleep Amerisleep AS1.
Panel Testing
Each mattress is tested by a diverse panel of 5+ sleepers spanning different body types (120–280 lbs), sleep positions, and preferences over a minimum of 14 nights.
Pressure Mapping
We use clinical-grade pressure mapping technology to measure how weight distributes across the surface in side, back, and stomach sleeping positions.
Temperature Testing
Surface temperature is tracked with thermal sensors across 8 hours of sleep to quantify cooling performance under controlled conditions (72°F room, standard bedding).
Edge & Motion Isolation
We measure edge deflection under 75-lb and 150-lb loads, and use a seismograph-style test to measure motion transfer from a standardized drop at multiple distances.
Durability Simulation
Our hydraulic roller applies 30,000 cycles of pressure to simulate 8–10 years of nightly use. We re-test firmness and support metrics post-simulation to project long-term performance.
Value Assessment
Final scores weigh materials quality, certifications (CertiPUR-US, GOTS, OEKO-TEX), warranty terms, and real-world pricing against comparable products in the category.
Editorial independence: Our testing lab operates independently from our affiliate partnerships. Brands cannot pay for higher scores or influence our methodology. Read our full editorial policy and detailed testing methodology.
Owner Reviews
Real opinions from Amerisleep AS1 owners. 0 reviews
Related Articles & Guides
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Read moreBest Time to Buy Sheets
White sale calendar & seasonal deal guide
Read moreMemorial Day Mattress Sales
Up to 40% off top brands this May
Read moreBlack Friday Mattress Sales
The biggest mattress discounts of the year
Read moreReal Owners Discussing This
Real owners share long-term updates, comparisons, and questions in our community.
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How Amerisleep AS1 compares
Side-by-side breakdowns we've published featuring Amerisleep.
Related Mattresses
Every Amerisleep model in our directory
Specs, construction, size options, and current pricing for each Amerisleep model we track — including the ones that haven't come through the Encinitas lab yet.
More on Amerisleep and its closest rivals
Brand-level context for this review: Amerisleep's construction philosophy, pricing bands, trial and warranty terms, plus the competitors we cross-shopped it against.
- Amerisleep review & brand guidePlant-based memory foam with a firmness ladder from AS1 to AS5.Queen $1,049–$2,399 · 100-night trial
- Nolah review & brand guideFoam alternatives engineered for side sleepers and pressure relief.Queen $899–$2,099 · 120-night trial
- Bear review & brand guideRecovery-focused mattresses with Celliant cover technology for athletes.Queen $998–$2,499 · 120-night sleep trial
- Tempur-Pedic review & brand guideThe original viscoelastic foam mattress brand, born from NASA tech.Queen $2,099–$6,499 · 90-night home trial
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