Specification and editorial comparison · lab measurements not available
Updated October 2026
Category
Beautyrest World Class (Level Three)
Serta iSeries Hybrid
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
8.5/10
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
Type
Innerspring
Hybrid
Firmness
6/10
6/10
Height
Varies by level
12 inches
Shipping
Free white glove delivery
Free shipping
Model specifications are catalog reference details, not instrumented measurements. Confirm the exact configuration and current seller terms.
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