IllustrationPressure relief for side sleepers
Why side sleeping concentrates load at the shoulders and hips, how much give you need at your weight, and the point where softer stops helping.
Sleep positions
How you lie decides what you need.
Your position sets where on the firmness scale you belong and which parts of a mattress the engine weights most. Pick yours to read the guide, or jump straight to a ranked list.
| Sleep position | Comfort window |
|---|---|
| Side | 3–6/10 |
| Back | 5–8/10 |
| Stomach | 6–9/10 |
| Combination | 5–8/10 |
The four sleep positions
Your shoulder and hip carry most of the load. The right mattress lets them sink in just far enough, and no further.
Side sleepers: comfort window by body weight Body weight Comfort window Under 130 lb 2–5/10 130–179 lb 3–6/10 180–229 lb 5–8/10 230 lb and up 6–9/10 Weighted up by the engine: Pressure relief 25% (default 20%)
Lying on your back spreads your weight widely. What matters is keeping your hips from sinking below your shoulders.
Back sleepers: comfort window by body weight Body weight Comfort window Under 130 lb 4–7/10 130–179 lb 5–8/10 180–229 lb 6–9/10 230 lb and up 7–10/10 Weighted up by the engine: Support & alignment 28% (default 25%)
Face down, your midsection is the low point. A mattress for stomach sleeping has to stop it from sagging.
Stomach sleepers: comfort window by body weight Body weight Comfort window Under 130 lb 5–8/10 130–179 lb 6–9/10 180–229 lb 7–10/10 230 lb and up 8–10/10 Weighted up by the engine: Support & alignment 31% (default 25%)
If you change position through the night, you need a mattress that is good at everything and bad at nothing.
Combination sleepers: comfort window by body weight Body weight Comfort window Under 130 lb 4–7/10 130–179 lb 5–8/10 180–229 lb 6–9/10 230 lb and up 7–10/10 Weights: no position rule applies, so every dimension keeps its default weight.
Weights shown for each position’s example profile at the default answers for everything else. Your own answers (temperature, partner, pain, edge, weight) move them further. How the weights work.
Illustration
Not sure which one you are?
Most people change position through the night. Pick combination in the quiz and the engine balances the windows for you.