Side-by-side mattress testing · 144+ comparisons published
Updated May 2026
Category
Beautyrest Black L-Class
King Koil Xtended Life
Comfort
8.5/10
8.4/10
Support
9.6/10
9.2/10
Cooling
9/10
8.3/10
Edge Support
9.5/10
9.1/10
Motion Isolation
8.5/10
8.4/10
Durability
9.4/10
9.3/10
Value
8.4/10
8.2/10
Quick Specs Comparison
Spec
Beautyrest Black L-Class
King Koil Xtended Life
Price (Queen)
$2,799
$2,549
Type
Hybrid
Hybrid
Firmness
8/10
7/10
Height
13.75 inches
14 inches
Trial
100 nights
120 nights
Warranty
10 years
10 years
Shipping
Free white glove delivery
Free shipping through most dealers
Key Advantages
Why Choose Beautyrest Black L-Class
- Firmest model — ideal for back/stomach sleepers
- Highest support rating in the lineup (9.6)
- Excellent for heavier sleepers (250+ lbs)
Why Choose King Koil Xtended Life
- Excellent support for heavier sleepers and couples over 400 lb combined
- Best edge support in the King Koil lineup
- High-density foams resist body impressions