Side-by-side mattress testing · 144+ comparisons published
Updated September 2026
Category
Helix Dusk Elite
Serta iSeries NXG 3500 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
8.3/10
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
Helix Dusk Elite
Serta iSeries NXG 3500 Hybrid
Price (Queen)
$3,278
$2,599
Type
Hybrid
Hybrid
Firmness
6/10
6.5/10
Height
15 inches
Varies by comfort level
Trial
120 nights
120 nights
Warranty
Limited lifetime warranty
10 years
Shipping
Free shipping; assembled in Arizona
Free shipping
Key Advantages
Why Choose Helix Dusk Elite
- ErgoAlign Contour Layer and zoned coils aimed squarely at lumbar support
- Microcoil pressure-distribution layer between high-density foams
- Up to 1,000 extra-firm wrapped coils with full perimeter reinforcement
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