Quick verdict
Yawnder Reviews · Updated September 2026
Amerisleep AS3 Review: Medium Plant-Based Foam Re-Tested
The Amerisleep AS3 is a 12-inch all-foam mattress aimed at sleepers who want a medium feel with responsive contouring. We tested the AS3 with Yawnder's standardized protocol on August 27, 2026.
Yawnder test results
| Overall score | 8.4 / 10 |
|---|---|
| Firmness | 6 / 10 |
| Spine alignment | 8.4 |
| Pressure relief | 8.8 |
| Cooling | 8.2 |
| Motion transfer | 8.8 |
| Edge support | 7.2 |
| Responsiveness | 8 |
| Expected durability | 8.4 |
| Off-gassing | 8.6 |
Standardized Yawnder test completed August 2026. See how we test and score.
Where it stands out
- Pressure relief 8.8/10, Motion transfer 8.8/10, Off-gassing 8.6/10
- Side and combination sleepers who want foam contouring with strong pressure relief.
- Model-specific Yawnder record is complete and separated from manufacturer claims.
Where it is limited
- Lowest measured categories: Edge support 7.2/10 and Responsiveness 8/10
- Feel and score profile apply to the tested configuration; other firmness choices can feel materially different.
Current specs and terms
| Type | Foam |
|---|---|
| Height / profile | 12 inches |
| Price reference | $1,549 Yawnder reference price |
| Trial | 100 nights |
| Warranty | 20-year limited |
Who should buy it
Side and combination sleepers who want foam contouring with strong pressure relief.
Common questions
What did Yawnder score it? 8.4/10 overall in the current standardized record.
How firm was the tested mattress? 6/10.
How long is the trial? 100 nights.
What is the warranty? 20-year limited.
Check today's Amerisleep AS3 price and promotion →
Yawnder Reviews · Disclosure: Brand links on this page may be affiliate links. If you buy through them, Yawnder may earn a commission at no additional cost to you. Test scores come from Yawnder's standardized mattress-testing record; current policies and promotional pricing are manufacturer-provided.
Standardized test data
Every mattress in the current program follows the same rubric and order, combining instrument-measured categories with hands-on evaluations so scores are comparable across brands.
| Measurement | Result | How to read it |
|---|---|---|
| Firmness | 6 | 1–10 scale (6.5 = medium-firm) |
| Construction | Foam | Foam / hybrid / latex / airbed |
| Profile height (Yawnder measured) | Not measured | inches — measured on our own sample |
| Motion transfer | 8.8 | score /10 — higher is less disturbance |
| Edge support | 7.2 | score /10 — sitting and sleeping edge |
| Temperature | 8.2 | score /10 — higher sleeps cooler |
| Pressure relief | 8.8 | score /10 — shoulder and hip |
| Spine alignment | 8.4 | score /10 — neutral posture |
| Ease of movement | Not measured | score /10 — repositioning speed |
| Expected durability | 8.4 | score /10 — projected 5-year hold |
| Off-gassing | 8.6 | score /10 — higher is less smell |
| Queen price | $1,549 | MSRP before seasonal discounts |
| Manufacturer sleep trial | 100 nights | when bought direct from the brand |
| Manufacturer warranty | 20-Year Limited | as published by the manufacturer; applies wherever you buy |
| Last test date | August 27, 2026 | date of our most recent standardized test session |
How this score is built
Support and spine alignment 25% · pressure relief 20% · temperature 15% · motion transfer 15% · edge support 10% · durability 10% · value 5%. Scores come from standardized instrument measurements and structured hands-on evaluations using the same Yawnder testing rubric. Read the full rubric.
Find a better mattress for you
Use Yawnder's standardized test data to compare this mattress with other models, or answer a few questions and narrow the field by sleep position, feel and priorities.
Compare before you buy
Compare this mattress against 142 tested mattresses
Sort all 142 mattresses we have tested by pressure relief, support, cooling, motion isolation, edge support, price, trial and warranty, then filter by how you actually sleep. Of those, 86 hold a complete standardized record and 41 a partial standardized record.