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