Side-by-side mattress testing · 144+ comparisons published
Updated May 2026
Category
Amerisleep AS4
Casper Dream Hybrid
Comfort
9.5/10
9/10
Support
8.5/10
9.1/10
Cooling
8.8/10
8.7/10
Edge Support
8.2/10
8.8/10
Motion Isolation
9.2/10
8.5/10
Durability
8.8/10
9/10
Value
8.7/10
8.9/10
Quick Specs Comparison
Spec
Amerisleep AS4
Casper Dream Hybrid
Price (Queen)
$1,499
$1,397
Type
Hybrid
Hybrid
Firmness
4/10
5.5/10
Height
12"
12 inches
Trial
100 nights
100 nights
Warranty
20 years
10 years
Shipping
Free shipping
Free shipping & returns
Key Advantages
Why Choose Amerisleep AS4
- Outstanding pressure relief for side sleepers
- Deep contouring at shoulders and hips eliminates pressure points
- Excellent motion isolation — ideal for couples
Why Choose Casper Dream Hybrid
- True medium feel works for most sleep positions
- Coil unit adds real edge support
- Sleeps cooler than any Casper foam model