Side-by-side mattress testing · 144+ comparisons published
Updated May 2026
Category
Sleep Number ComfortNext Lux
King Koil Reserve Luxury
Comfort
9/10
9.3/10
Support
9/10
8.8/10
Cooling
8.8/10
8.4/10
Edge Support
8/10
8.7/10
Motion Isolation
9.3/10
8.3/10
Durability
8.8/10
9/10
Value
7.5/10
7.4/10
Quick Specs Comparison
Spec
Sleep Number ComfortNext Lux
King Koil Reserve Luxury
Price (Queen)
$3,999
$3,799
Type
Air Chamber Hybrid
Luxury Pillow-Top Hybrid
Firmness
5/10
5.5/10
Height
13 inches
15 inches
Trial
100 nights
120 nights
Warranty
15 years
10 years
Shipping
In-home delivery
White glove delivery through retail partners
Key Advantages
Why Choose Sleep Number ComfortNext Lux
- Superior pressure relief for all major pain points
- 67% more cooling materials than ComfortMode
- Superior airflow engineering
Why Choose King Koil Reserve Luxury
- Genuinely plush pillow-top with natural fiber quilting
- Hand-tufted construction resists body impressions over time
- Strong pressure relief for side sleepers