by Quick answer: Most side sleepers feel best on a soft to medium mattress, roughly 4 to 6 on a 10-point scale. A side sleeper's shoulders and hips need extra cushioning so they can sink in slightly, keeping the spine straight rather than bent at the pressure points.
By the MattressNut editorial team · Updated June 2026
Best Firmness for Side Sleepers — The Short Answer
On your side, your shoulder and hip carry most of your weight against the mattress. A surface with enough give lets those points settle in so your spine stays level from neck to hips. A mattress that's too firm leaves the shoulder propped up and the waist unsupported, which can cause aches.
What Matters Most
Pressure relief is the priority for side sleepers, but the mattress still needs support underneath so you don't bottom out. Body weight matters: lighter side sleepers often want softer, while heavier side sleepers may need a medium feel to avoid sinking too far. A pillow that fills the gap between your head and shoulder helps too.
Quick Reference
| Factor | Detail |
|---|---|
| Typical sweet spot | Soft to medium, about 4–6 of 10 |
| Why it works | Cushions shoulder and hip, keeps spine level |
| Lighter bodies | Often prefer softer (4–5) |
| Heavier bodies | Often prefer medium (5–6) for support |
Practical Tips
Lie on your side and have someone check whether your spine looks straight. If your shoulder feels jammed or your hip aches, the mattress is likely too firm. If your back sags in the middle, it's too soft. Pair the right firmness with a supportive pillow. Ongoing shoulder or hip pain is worth raising with a doctor.
Our Recommended Mattress
For side sleepers, the Saatva Classic in its Plush Soft option gives the extra cushioning that shoulders and hips need while its coil-on-coil innerspring-hybrid base keeps you from sinking too far. That combination cradles pressure points and still holds the spine in line. The 365-night home trial lets you test it in your own bed before deciding.
See the Saatva Classic and its 365-night trial
The Bottom Line
Side sleepers want enough softness to cushion the shoulder and hip, with support underneath to keep the spine level. Soft to medium is the usual sweet spot, adjusted for your weight.
Bottom line: Most side sleepers do best on a soft-to-medium mattress around 4–6 of 10.
Related: our full Saatva mattress review and best mattress for back pain.