Side-by-side mattress testing · 144+ comparisons published
Updated September 2026
Category
Serta iSeries NXG 4500 Ultra Plush Foam
Casper Snow Max Hybrid
Comfort
Not lab tested
Not lab tested
Support
Not lab tested
Not lab tested
Cooling
Not lab tested
Not lab tested
Edge Support
Not lab tested
Not lab tested
Motion Isolation
Not lab tested
Not lab tested
Durability
Not lab tested
Not lab tested
Value
7.8/10
8/10
Blank cells mean that model has not completed our instrumented lab protocol, so we publish no measured score for it. We never estimate a number we have not recorded.
Quick Specs Comparison
Spec
Serta iSeries NXG 4500 Ultra Plush Foam
Casper Snow Max Hybrid
Price (Queen)
$2,799
$2,884
Type
Memory Foam
Hybrid
Firmness
3.5/10
4.5/10
Height
Varies by comfort level
14 inches
Trial
120 nights
100 nights
Warranty
10 years
10 years
Shipping
Free shipping
Free shipping & returns
Key Advantages
Why Choose Serta iSeries NXG 4500 Ultra Plush Foam
- Genuinely plush — deep shoulder and hip relief
- Best-in-line motion isolation
- Ultimate Edge keeps a plush foam bed from collapsing at the rail
Why Choose Casper Snow Max Hybrid
- Best cooling and best support Casper offers
- QuickCool cover plus Snow Technology foam
- Medium-soft conforming feel with lumbar hold