Side-by-side mattress testing · 144+ comparisons published
Updated May 2026
Category
Sleep Number ComfortNext Ultra
King Koil Reserve Luxury
Comfort
9.2/10
9.3/10
Support
9.2/10
8.8/10
Cooling
9/10
8.4/10
Edge Support
8.2/10
8.7/10
Motion Isolation
9.4/10
8.3/10
Durability
9/10
9/10
Value
7.2/10
7.4/10
Quick Specs Comparison
Spec
Sleep Number ComfortNext Ultra
King Koil Reserve Luxury
Price (Queen)
$4,499
$3,799
Type
Air Chamber Hybrid
Luxury Pillow-Top Hybrid
Firmness
5/10
5.5/10
Height
14 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 Ultra
- Maximum pressure relief across all zones
- 175% more cooling than ComfortMode
- 14-inch premium profile
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