Side-by-side mattress testing · 144+ comparisons published
Updated May 2026
Category
Serta iComfortPro Level Two
King Koil Natural
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
8/10
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
Serta iComfortPro Level Two
King Koil Natural
Price (Queen)
$2,499
$2,349
Type
Latex Hybrid Foam
Natural Hybrid
Firmness
6/10
6/10
Height
Varies by comfort level
13 inches
Trial
120 nights
120 nights
Warranty
10 years
10 years
Shipping
Free shipping
Free shipping through most dealers
Key Advantages
Why Choose Serta iComfortPro Level Two
- Up to 5" of professional-grade latex — springier and more durable than memory foam
- Five support zones aimed at aches and back discomfort
- Advanced cooling system in the cover
Why Choose King Koil Natural
- Natural fibers and latex rather than all petroleum-based foam
- Very good breathability — wool and cotton help wick moisture
- Strong pressure relief without a sinking feel