Specification and editorial comparison · lab measurements not available
Updated October 2026
Category
Siena Memory Foam
Novaform ComfortGrande
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
9.6/10
9.5/10
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
Siena Memory Foam
Novaform ComfortGrande
Type
Memory Foam
Memory Foam
Firmness
6/10
5.5/10
Height
10 inches
14 inches
Shipping
Free shipping
Free shipping from Costco
Model specifications are catalog reference details, not instrumented measurements. Confirm the exact configuration and current seller terms.
Key Advantages
Why Choose Siena Memory Foam
- Genuine memory foam comfort
Why Choose Novaform ComfortGrande
- Incredible Costco value
- Costco's unlimited return policy