Amerisleep AS3 vs Casper The One
Detailed side-by-side comparison — pricing, specs, performance ratings, and our pick.
| Feature | Amerisleep AS3 | Casper The One |
|---|---|---|
| Overview | ||
Type | Memory Foam | Memory Foam |
Firmness Published feel or standardized wording | Medium | Medium-Firm |
Queen Price Current / sale price | $1,149Save $600$1,749 | $899Save $250$1,149 |
Trial Period Terms from the linked seller | ✓ 100 nights at Amerisleep; 30-night minimum; free pickup | ✓ 100 nights at Casper; returns after 30 nights; free eligible return |
Warranty | 20 years | 10 years |
| Performance Ratings | ||
Cooling Hot sleepers | Very good | Average |
Motion Isolation Partners, light sleepers | Excellent | Excellent |
Pressure Relief Shoulder and hip cushioning | Very good | Good |
Edge Support Sit/sleep near edge | Average | Fair |
Durability Long-term performance | Average | Good |
| Compatibility & Features | ||
Adjustable Base Head/foot elevation | ✓ Yes | ✓ Yes |
Split King Support Two Twin XL per couple | ✓ Yes | ✓ Yes |
Financing | Affirm, Klarna | Affirm |
| Materials & Certification Scope | ||
Listed certifications / claims Check model and material scope |
| None listed |
Certificate limitations Not an odor or safety guarantee | Confirm the certificate for the exact model and covered materials. A material certificate does not certify every part of a mattress or guarantee no odor. | Confirm the certificate for the exact model and covered materials. A material certificate does not certify every part of a mattress or guarantee no odor. |
| Best For | ||
Ideal sleeper profiles |
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| Actions | Full ReviewCheck price at Amerisleep → Buy with confidence 100-night risk-free sleep trial at Amerisleep | |
Need Help Deciding?
For most sleepers, we recommend the Amerisleep AS3 over the Casper The One. It scores higher in cooling, pressure relief, edge support; decide whether those advantages justify the $250 Queen premium ($1,149 vs $899). The Casper The One is the better choice only if you have a strong preference for that brand's specific feel or design.
Amerisleep AS3 vs Casper The One: What Actually Differs
Both the Amerisleep AS3 and Casper The One are memory foam mattresses, so the real differences come down to firmness tuning, performance ratings, and price rather than construction type. The Amerisleep AS3 stands 12" tall versus 11" for the Casper The One — a 1.0" gap that matters if you need deep-pocket sheets or are pairing with an adjustable base. The Casper The One is the firmer of the two at 6.5/10 (medium-firm), and the Amerisleep AS3 sits at 5/10 (medium) — a meaningful enough gap that sleeper position and weight should drive the choice. The single largest performance gap is in cooling: the Amerisleep AS3 rates noticeably higher than the Casper The One, which is the deciding factor if that dimension is high on your list. On a Queen, the Casper The One runs $899 versus $1,149 for the Amerisleep AS3 — roughly $250 (22%) less, which is enough to factor into the decision unless the pricier model wins clearly on the specs you care about.
Which Is Better For Your Sleep Style?
Higher pressure-relief rating, which is what protects hip and shoulder contact points in the side position.
Medium-Firm includes the option closest to a balanced medium feel for back sleepers (vs Medium).
Medium-Firm includes the firmer published option (vs Medium), which may better suit shoppers who prefer more surface support.
Stronger cooling rating, which matters most for sleepers who run hot or live in warm climates.
better long-term durability — the two specs heavier sleepers should weigh most.
Medium includes the softer published option (vs Medium-Firm), which can make contouring easier for lighter sleepers.
Motion isolation rated the same on both — neither has a transfer-disturbance edge.
Price Comparison (Queen)
| Mattress | Regular price | Current | Sale? |
|---|---|---|---|
| Casper The One | $1,149 | $899 | Save $250 |
| Amerisleep AS3 | $1,749 | $1,149 | Save $600 |
The Casper The One is the lower-priced choice at $899. The Amerisleep AS3 costs $250 more — 28% above the lower current price. Weigh that premium against the literal differences above and the benefits you expect to notice. Both are currently below their listed comparison prices.
Amerisleep AS3
Strengths
- ✓Three inches of Bio-Pur and two inches of HIVE reverse AS2's 2/3-inch comfort-to-transition ratio, giving AS3 more surface contour while keeping the same 12-inch height and seven-inch Bio-Core base
- ✓The five-zone HIVE cuts provide firmer response beneath the head, back, and legs and more give beneath the shoulders and hips according to Amerisleep's current construction description
- ✓Choose AS3 Foam over AS3 Hybrid for quieter, steadier all-foam contour and the lower current catalog price; choose Hybrid for spring response, support-core airflow, and a stronger perimeter
- ✓The solid-foam support core avoids connected coil movement, a practical construction advantage for couples who prioritize motion isolation over bounce
Considerations
- —Strict stomach sleepers and many sleepers over 230 pounds should compare the medium-firm AS2 or coil-supported AS3 Hybrid before choosing this medium foam design
- —All-foam AS3 has less perimeter reinforcement and through-bed airflow than AS3 Hybrid's eight-inch zoned pocketed-coil core
- —Amerisleep's seven-degree Refresh comparison, cooling, recovery, circulation, alignment, pressure, pain, motion, edge, and durability statements are manufacturer or construction evidence rather than SleepRanked lab results
Casper The One
Strengths
- ✓Three-layer foam build with Casper Core support
- ✓Strong motion isolation for an all-foam bed
- ✓Split King available
Considerations
- —No coil edge feel
- —No active Snow cooling package
- —Medium-firm feel is less plush than Cloud One
Who Should Buy Which?
The Amerisleep AS3 is the better fit when:
- →You sleep hot and want the stronger cooling rating.
- →You sleep on your side and prioritize stronger pressure-relief data.
- →You sit or sleep near the edge and want the stronger perimeter rating.
- →You prefer a softer, more cushioned feel.
The Casper The One is the better fit when:
- →You want the lower current Queen price and do not need the other model's added features.
- →You prefer firmer surface support.