Side-by-side mattress testing · 144+ comparisons published
Updated May 2026
Category
Serta iSeries NXG 3500 Hybrid
Purple Restore Hybrid
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
8.4/10
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 Hybrid
Purple Restore Hybrid
Price (Queen)
$2,599
$2,140
Type
Hybrid
Hybrid
Firmness
6.5/10
6/10
Height
Varies by comfort level
12 inches
Trial
120 nights
100 nights
Warranty
10 years
10 years
Shipping
Free shipping
Free shipping; in-home setup and old mattress removal available as a paid add-on
Key Advantages
Why Choose Serta iSeries NXG 3500 Hybrid
- Micro coil layer boosts pressure relief without killing support
- CoolFeel Plus is Serta's strongest cooling package
- Split-head queen and king sizes available
Why Choose Purple Restore Hybrid
- 2-inch GelFlex Grid delivers firm lumbar support and deep shoulder-hip pressure relief simultaneously — no other material does both
- Open grid lattice means nothing traps heat; the coolest-sleeping mainstream hybrid we test
- Responsive coil unit makes it easy to move on and comfortable for combination sleepers