Side-by-side mattress testing · 144+ comparisons published
Updated May 2026
Category
Serta iSeries NXG 3500 Medium Foam
Tempur-Pedic TEMPUR-ProAdapt
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
8/10
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
Serta iSeries NXG 3500 Medium Foam
Tempur-Pedic TEMPUR-ProAdapt
Price (Queen)
$2,599
$2,999
Type
Memory Foam
Memory Foam
Firmness
5.5/10
5/10
Height
Varies by comfort level
12 inches
Trial
120 nights
90 nights
Warranty
10 years
10 years
Shipping
Free shipping
Free white glove delivery
Key Advantages
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
Why Choose Tempur-Pedic TEMPUR-ProAdapt
- SmartClimate dual cover system
- Available in 4 firmness options
- Extra TEMPUR comfort layer vs Adapt