Side-by-side mattress testing · 144+ comparisons published
Updated September 2026
Category
Serta iSeries NXG 4500 Ultra Plush Foam
Loom & Leaf Memory Foam
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
7.8/10
8.2/10
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 iSeries NXG 4500 Ultra Plush Foam
Loom & Leaf Memory Foam
Price (Queen)
$2,799
$2,674
Type
Memory Foam
Memory Foam
Firmness
3.5/10
5/10
Height
Varies by comfort level
12 inches
Trial
120 nights
365 nights
Warranty
10 years
Lifetime
Shipping
Free shipping
Free white-glove in-room delivery, setup, and old mattress removal
Key Advantages
Why Choose Serta iSeries NXG 4500 Ultra Plush Foam
- Genuinely plush — deep shoulder and hip relief
- Best-in-line motion isolation
- Ultimate Edge keeps a plush foam bed from collapsing at the rail
Why Choose Loom & Leaf Memory Foam
- Best-in-class motion isolation — a partner getting up is essentially undetectable
- 5-lb density memory foam is Tempur-Pedic-grade, well above the 3-lb foam typical of boxed beds
- Ships flat by white-glove delivery instead of compressed, which protects foam cell structure