Side-by-side mattress testing · 144+ comparisons published
Updated May 2026
Category
Serta iSeries Hybrid
Nolah Evolution 15
Comfort
8.8/10
9.3/10
Support
9/10
9.2/10
Cooling
8.7/10
9.1/10
Edge Support
9/10
9/10
Motion Isolation
8.6/10
9.2/10
Durability
8.9/10
9.1/10
Value
8.5/10
9/10
Quick Specs Comparison
Spec
Serta iSeries Hybrid
Nolah Evolution 15
Price (Queen)
$1,399
$1,199
Type
Hybrid
Hybrid
Firmness
6/10
6/10
Height
12 inches
15 inches
Trial
120 nights
120 nights
Warranty
10 years
Lifetime
Shipping
Free shipping
Free shipping
Key Advantages
Why Choose Serta iSeries Hybrid
- Trusted 90+ year brand
- Widely available in stores
- Good balance of comfort and support
Why Choose Nolah Evolution 15
- AirFoam doesn't trap heat like memory foam
- Excellent pressure relief
- Tall 15" profile feels luxurious
Lab Verdict
Cooling was a wash — both mattresses landed within half a degree of each other after 60 minutes of body heat. Nolah Evolution 15 isolated motion better for couples (0.09g vs. 0.12g on the Serta iSeries Hybrid). The Nolah Evolution 15 relieved more shoulder pressure for side sleepers (30 mmHg vs. 32 mmHg). Perimeter compression was nearly identical — neither bed is the obvious pick on edge support alone. Responsiveness was comparable; repositioning effort should feel similar on either.
| Metric | Serta iSeries Hybrid | Nolah Evolution 15 | Edge |
|---|---|---|---|
| Cooling (60-min Δ°F) | 3.3°F | 3°F | Nolah Evolution 15 |
| Motion isolation (g) | 0.12g | 0.09g | Tie |
| Edge sinkage | 2" | 2" | Tie |
| Shoulder pressure (mmHg) | 32 mmHg | 30 mmHg | Nolah Evolution 15 |
| Response time (s) | 0.6s | 0.6s | Tie |
| Off-gassing | 2 days | 2 days | Tie |
Median of 3 trials, 68°F climate-controlled lab. DH/KW / KW/BT · scoring vv2.1.