Side sleepers usually need a softer to medium mattress that lets shoulders and hips sink in. Back sleepers tend to do best on medium to medium-firm, which supports the lower back. Stomach sleepers usually need firmer support to keep hips from sagging. Heavier sleepers feel any mattress as softer and benefit from hybrids with strong coils; lighter sleepers feel mattresses as firmer.
The right mattress keeps your spine in a neutral line in the position you sleep in most. Start there, then adjust for body weight.
Firmness by sleep position
| Position | Usually suits | Why |
|---|---|---|
| Side | Soft to medium | Shoulders and hips need to sink in |
| Back | Medium to medium-firm | Supports the lower back |
| Stomach | Medium-firm to firm | Keeps hips from sinking |
| Combination | Medium, responsive | Easy to change position |
Body weight changes the feel
- Under about 60 kg (130 lb): mattresses feel firmer; softer comfort layers help.
- About 60 to 105 kg (130 to 230 lb): most mattresses feel as described.
- Over about 105 kg (230 lb): mattresses feel softer; look for hybrids with sturdy coils, thicker profiles and strong edge support.
Mattress types
| Type | Feel | Strengths |
|---|---|---|
| Memory foam | Slow, contouring | Pressure relief, motion isolation |
| Hybrid | Supportive, bouncy | Edge support, airflow, durability |
| Latex | Responsive, buoyant | Durability, cooler than memory foam |
| Innerspring | Bouncy, firm | Price, airflow |
Use the trial
Check the trial length, break-in period and return costs before you buy. See mattress trials and warranties. Hot sleepers should also read how to sleep cooler.
Browse mattresses.
Common questions
What firmness is best for back pain?
Many people with lower back pain prefer medium-firm, but comfort is personal. Use the trial period, and talk to a doctor about persistent pain.
What if I sleep in several positions?
Combination sleepers often prefer medium firmness with responsive foam or latex, which makes turning over easier.
Are firmness scales the same across brands?
No. A 6 on one brand's 10-point scale can feel different from another brand's 6. Read the brand's description and use the trial.
How long does a new mattress take to break in?
Many brands suggest 30 days. That is why trials often require you to keep the mattress for a minimum period before returning it.