Amerisleep AS1 vs Casper The One
Detailed side-by-side comparison — pricing, specs, performance ratings, and our pick.
| Feature | Amerisleep AS1 | Casper The One |
|---|---|---|
| Overview | ||
Type | Foam | Memory Foam |
Firmness Published feel or standardized wording | Firm | Medium-Firm |
Queen Price Current / sale price | Queen sold out | $1,074Save $75$1,149 |
Trial Period Terms from the linked seller | 100 nights at Amerisleep | ✓ 100 nights at Casper; returns after 30 nights; free eligible return |
Warranty | 20 years | 10 years |
| Performance Ratings | ||
Cooling Hot sleepers | Good | Average |
Motion Isolation Partners, light sleepers | Very good | Excellent |
Pressure Relief Shoulder and hip cushioning | Average | Good |
Edge Support Sit/sleep near edge | Average | Fair |
Durability Long-term performance | Good | Good |
| Compatibility & Features | ||
Adjustable Base Head/foot elevation | ✓ Yes | ✓ Yes |
Split King Support Two Twin XL per couple | ✓ Yes | ✓ Yes |
Financing | Available | 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 | ||
Need Help Deciding?
For most sleepers, we recommend the Amerisleep AS1 over the Casper The One. Our catalog rates it higher for cooling, edge support; check current linked-seller prices and terms before deciding on value. The Casper The One is the better choice only if you have a strong preference for that brand's specific feel or design.
Amerisleep AS1 vs Casper The One: What Actually Differs
The Amerisleep AS1 is a foam build, while the Casper The One is a memory foam — that construction difference drives most of the cooling, motion, and feel decisions below. The Casper The One stands 11" tall versus 10" for the Amerisleep AS1 — a 1.0" gap that matters if you need deep-pocket sheets or are pairing with an adjustable base. Their firmness is close but not identical: the Amerisleep AS1 is 7/10 and the Casper The One is 6.5/10. Both land near a medium-firm feel, so the half-point difference is less decisive than their construction and pressure response. The single largest performance gap is in cooling: the Amerisleep AS1 rates noticeably higher than the Casper The One, which is the deciding factor if that dimension is high on your list.
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 Firm).
Firm includes the firmer published option (vs Medium-Firm), 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.
stronger perimeter / edge support — the two specs heavier sleepers should weigh most.
Medium-Firm includes the softer published option (vs Firm), which can make contouring easier for lighter sleepers.
Higher motion-isolation rating, which means less disturbance when a partner moves or gets out of bed.
Amerisleep AS1
Strengths
- ✓The simple 2-inch comfort layer over an 8-inch support core creates a flatter, lower-sink choice for back and stomach sleepers
- ✓At the checked prices, AS1 is Amerisleep's least expensive current mattress and costs $200 less than AS2 in matching listed sizes
- ✓The all-foam build should limit partner disturbance better than a springier hybrid, although SleepRanked has not measured motion transfer
- ✓Twin XL, Cal King, and Split King were immediately purchasable in the current first-party variant data
Considerations
- —Amerisleep does not recommend this Firm model for side sleepers because the surface may not cushion the shoulder and hip enough
- —There is no HIVE targeted-support layer, no dedicated reinforced edge, and no AS1 hybrid version
- —Twin, Full, Queen, and King were temporarily sold out when the current exact product was verified
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 AS1 is the better fit when:
- →You sleep hot and want the stronger cooling rating.
- →You sit or sleep near the edge and want the stronger perimeter rating.
The Casper The One is the better fit when:
- →You share the bed or wake easily when your partner moves.
- →You sleep on your side and prioritize stronger pressure-relief data.