Side-by-side mattress testing · 144+ comparisons published
Updated September 2026
Category
Saatva Contour5
Serta iSeries NXG 3500 Medium Foam
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
8.3/10
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
Saatva Contour5
Serta iSeries NXG 3500 Medium Foam
Price (Queen)
$2,674
$2,599
Type
Memory Foam
Memory Foam
Firmness
5.5/10
5.5/10
Height
12.5 inches
Varies by comfort level
Trial
365 nights
120 nights
Warranty
Lifetime warranty
10 years
Shipping
Free white glove delivery, in-room setup and old mattress removal
Free shipping
Key Advantages
Why Choose Saatva Contour5
- Deep memory-foam contouring with a zoned lumbar layer rather than uniform sink
- Saatva publishes the foam densities — 4 lb gel memory foam over a 3-inch 5 lb core
- Phase-change material built into the lumbar matrix instead of only in the cover
Why Choose Serta iSeries NXG 3500 Medium Foam
- Deep memory-foam contouring with a medium feel
- Ultimate Edge support is unusually firm for an all-foam bed
- CoolFeel Plus counters the usual memory-foam heat