Side-by-side mattress testing · 144+ comparisons published
Updated September 2026
Category
Serta iSeries NXG 4500 Ultra Plush Foam
Saatva Contour5
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
7.8/10
8.3/10
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
Serta iSeries NXG 4500 Ultra Plush Foam
Saatva Contour5
Price (Queen)
$2,799
$2,674
Type
Memory Foam
Memory Foam
Firmness
3.5/10
5.5/10
Height
Varies by comfort level
12.5 inches
Trial
120 nights
365 nights
Warranty
10 years
Lifetime warranty
Shipping
Free shipping
Free white glove delivery, in-room setup and old mattress removal
Key Advantages
Why Choose Serta iSeries NXG 4500 Ultra Plush Foam
- Genuinely plush — deep shoulder and hip relief
- Best-in-line motion isolation
- Ultimate Edge keeps a plush foam bed from collapsing at the rail
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