Side-by-side mattress testing · 144+ comparisons published
Updated May 2026
Category
Sleep Number i8 Smart Bed
Saatva Classic
Comfort
8.8/10
9.3/10
Support
8.9/10
9.6/10
Cooling
8.5/10
9.4/10
Edge Support
8/10
9.7/10
Motion Isolation
9.5/10
8.8/10
Durability
8.3/10
9.5/10
Value
7.5/10
8.9/10
Quick Specs Comparison
Spec
Sleep Number i8 Smart Bed
Saatva Classic
Price (Queen)
$3,099
$1,295
Type
Air Chamber
Innerspring Hybrid
Firmness
5/10
6/10
Height
11 inches
14.5 inches
Trial
100 nights
365 nights
Warranty
15 years
Lifetime
Shipping
In-home delivery
Free white glove delivery
Key Advantages
Why Choose Sleep Number i8 Smart Bed
- Adjustable firmness 0-100
- Dual-zone for couples
- Advanced sleep tracking
Why Choose Saatva Classic
- Free white glove delivery and setup
- Exceptional breathability - sleeps very cool
- Outstanding edge support for sitting
Lab Verdict
Cooling was a wash — both mattresses landed within half a degree of each other after 60 minutes of body heat. Couples should note that the Sleep Number i8 Smart Bed dampened motion more aggressively (0.07g peak vs. 0.18g). The Saatva Classic relieved more shoulder pressure for side sleepers (28 mmHg vs. 31 mmHg). The Saatva Classic held a firmer perimeter (1.9" sinkage vs. 2.3"). Combo sleepers will get more rebound from the Sleep Number i8 Smart Bed (58% bounce vs. 42%).
| Metric | Sleep Number i8 Smart Bed | Saatva Classic | Edge |
|---|---|---|---|
| Cooling (60-min Δ°F) | 3.5°F | 3.2°F | Saatva Classic |
| Motion isolation (g) | 0.07g | 0.18g | Sleep Number i8 Smart Bed |
| Edge sinkage | 2.3" | 1.9" | Saatva Classic |
| Shoulder pressure (mmHg) | 31 mmHg | 28 mmHg | Saatva Classic |
| Response time (s) | 0.6s | 0.4s | Saatva Classic |
| Off-gassing | 2 days | 0 days | Saatva Classic |
Median of 3 trials, 68°F climate-controlled lab. NL/KW / DH/KW · scoring vv2.1.