Side-by-side mattress testing · 144+ comparisons published
Updated May 2026
Category
Serta iComfortPro Level Three
King Koil Reserve Luxury
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
7.6/10
7.4/10
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 Three
King Koil Reserve Luxury
Price (Queen)
$3,599
$3,799
Type
Latex Hybrid Foam
Luxury Pillow-Top Hybrid
Firmness
5.5/10
5.5/10
Height
Varies by comfort level
15 inches
Trial
120 nights
120 nights
Warranty
10 years
10 years
Shipping
Free shipping
White glove delivery through retail partners
Key Advantages
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
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