Side-by-side mattress testing · 144+ comparisons published
Updated May 2026
Category
Beautyrest World Class (Level Three)
Serta iSeries Hybrid
Comfort
Not lab tested
8.8/10
Support
Not lab tested
9/10
Cooling
Not lab tested
8.7/10
Edge Support
Not lab tested
9/10
Motion Isolation
Not lab tested
8.6/10
Durability
Not lab tested
8.9/10
Value
8/10
8.5/10
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 World Class (Level Three)
Serta iSeries Hybrid
Price (Queen)
$1,399
$1,399
Type
Innerspring
Hybrid
Firmness
6/10
6/10
Height
Varies by level
12 inches
Trial
100 nights
120 nights
Warranty
10 years
10 years
Shipping
Free white glove delivery
Free shipping
Key Advantages
Why Choose Beautyrest World Class (Level Three)
- Meaningful upgrade in pressure relief over the Core levels
- Best motion separation in the non-Black range
- Breathable cooling built into the comfort stack
Why Choose Serta iSeries Hybrid
- Trusted 90+ year brand
- Widely available in stores
- Good balance of comfort and support