Amerisleep AS5 vs Casper The One
Detailed side-by-side comparison — pricing, specs, performance ratings, and our pick.
| Feature | Amerisleep AS5 | Casper The One |
|---|---|---|
| Overview | ||
Type | Memory Foam | Memory Foam |
Firmness Published feel or standardized wording | Soft | Medium-Firm |
Queen Price Current / sale price | Check retailer | Check retailer |
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 | Excellent | 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 AS5 over the Casper The One. Our catalog rates it higher for cooling, pressure relief, edge support; check current linked-seller prices and terms before deciding on value. The Casper The One is the better choice only if you specifically prefer a firmer, more supportive feel.
Amerisleep AS5 vs Casper The One: What Actually Differs
Both the Amerisleep AS5 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 AS5 stands 14" tall versus 11" for the Casper The One — a 3.0" 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 AS5 sits at 3/10 (soft) — a meaningful enough gap that sleeper position and weight should drive the choice. The single largest performance gap is in cooling: the Amerisleep AS5 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 Soft).
Medium-Firm includes the firmer published option (vs Soft), 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.
Soft 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.
Amerisleep AS5
Strengths
- ✓The five-inch comfort system combines three inches of Bio-Pur with two inches of faster-rebounding Active Flex for deep cushioning without relying on slow memory foam alone
- ✓Two inches of five-zone HIVE foam provide firmer response beneath the head, back, and legs and more give beneath the shoulders and hips according to Amerisleep's construction description
- ✓Choose AS5 Foam over AS5 Hybrid for quieter, steadier contour and the lower current catalog price; choose Hybrid for spring response, support-core airflow, easier movement, and a stronger perimeter
- ✓The solid Bio-Core support layer avoids connected coil movement, a practical construction advantage for couples who prioritize motion isolation over bounce
Considerations
- —The soft 3/10 feel and five inches of comfort foam are a poor starting point for strict stomach sleepers and shoppers who want a flat, firm surface
- —Amerisleep includes heavy sleepers in its broad AS5 positioning but publishes no product capacity or independent compression result on the reviewed page; higher-bodyweight back and stomach sleepers should compare firmer and coil-supported options
- —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 AS5 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 prefer firmer surface support.