Side-by-side mattress testing · 144+ comparisons published
Updated May 2026
Category
Novaform ComfortGrande
Siena Memory Foam
Comfort
8.5/10
8.6/10
Support
8.3/10
8.4/10
Cooling
8/10
8.2/10
Edge Support
7.8/10
7.8/10
Motion Isolation
8.8/10
9/10
Durability
8.2/10
8.2/10
Value
9.5/10
9.6/10
Quick Specs Comparison
Spec
Novaform ComfortGrande
Siena Memory Foam
Price (Queen)
$449
$399
Type
Memory Foam
Memory Foam
Firmness
5.5/10
6/10
Height
14 inches
10 inches
Trial
Costco return policy
180 nights
Warranty
20 years
10 years
Shipping
Free shipping from Costco
Free shipping
Key Advantages
Why Choose Novaform ComfortGrande
- Incredible Costco value
- 14-inch luxury height
- Costco's unlimited return policy
Why Choose Siena Memory Foam
- Under $500 for a Queen
- 180-night trial — best in budget category
- Genuine memory foam comfort