Side-by-side mattress testing · 144+ comparisons published
Updated September 2026
Category
Beautyrest Black K-Class
Serta iComfortPro Level Three
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
8/10
7.6/10
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
Beautyrest Black K-Class
Serta iComfortPro Level Three
Price (Queen)
$3,499
$3,599
Type
Hybrid (Pillow Top)
Latex Hybrid Foam
Firmness
4/10
5.5/10
Height
16.5 inches
Varies by comfort level
Trial
100 nights
120 nights
Warranty
10 years
10 years
Shipping
Free white glove delivery
Free shipping
Key Advantages
Why Choose Beautyrest Black K-Class
- Incredibly plush pillow-top comfort
- BlackICE 4.0 cooling on BOTH sides
- 16.5" height — most luxurious profile
Why Choose Serta iComfortPro Level Three
- Up to 13" of professional-grade latex — the deepest comfort stack Serta sells
- Graphite-infused latex adds heat dissipation
- Five support zones for alignment