Specification and editorial comparison · lab measurements not available
Updated October 2026
Category
King Koil FLOWT
Beautyrest Black C-Class
Comfort
Not lab tested
Not lab tested
Support
Not lab tested
Not lab tested
Cooling
Not lab tested
Not lab tested
Edge Support
Not lab tested
Not lab tested
Motion Isolation
Not lab tested
Not lab tested
Durability
Not lab tested
Not lab tested
Value
7.8/10
8.3/10
Blank cells mean that model has not completed our instrumented lab protocol, so we publish no measured score for it. We never estimate a number we have not recorded.
Quick Specs Comparison
Spec
King Koil FLOWT
Beautyrest Black C-Class
Type
Luxury Hybrid
Hybrid
Firmness
6/10
6/10
Height
14 inches
14.5 inches
Shipping
Free white glove delivery on most orders
Free white glove delivery
Model specifications are catalog reference details, not instrumented measurements. Confirm the exact configuration and current seller terms.
Key Advantages
Why Choose King Koil FLOWT
- Spiral coil system keeps lateral airflow open — excellent heat dissipation
- Cooling gel comfort layers stay neutral through the night
- Responsive medium feel suits combination sleepers
Why Choose Beautyrest Black C-Class
- Best cooling in the Black lineup
- Versatile medium-firm feel suits most sleepers
- BlackICE 4.0 + RightTemp foam combo