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