Specification and editorial comparison · lab measurements not available
Updated October 2026
Category
Serta iSeries NXG 1500 Hybrid Firm
Casper Snow 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
Not lab tested
Not lab tested
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 1500 Hybrid Firm
Casper Snow Hybrid
Type
Hybrid
Hybrid
Firmness
7.5/10
5.5/10
Height
Varies by comfort level
12 inches
Shipping
Free shipping
Free shipping & returns
Model specifications are catalog reference details, not instrumented measurements. Confirm the exact configuration and current seller terms.
Key Advantages
Why Choose Serta iSeries NXG 1500 Hybrid Firm
- Firm, supportive feel that suits back and stomach sleepers
- CoolFeel cover plus carbon fiber foam for heat management
- Q4 zoned coil unit distributes weight evenly
Why Choose Casper Snow Hybrid
- The coolest-sleeping mattress Casper builds
- Cool-to-the-touch QuickCool cover
- Conforming memory foam feel without heat trap