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The best side sleeper mattress typically has a medium-soft to medium-firm feel, about 5 to 6 out of 10, to cushion the hips and shoulders while helping keep the spine aligned. The ideal feel can vary based on body weight and whether you experience hip or shoulder discomfort.
The best side sleeper mattress is usually medium-soft to medium-firm, about 5 to 6 out of 10 on the firmness scale, because it cushions the hips and shoulders while supporting healthy spinal alignment.
For many side sleepers, this range provides a balance between comfort and support. A mattress that is too firm can create pressure at the shoulder or hip. A mattress that is too soft may allow the midsection to sink too deeply, which can make the spine feel unsupported.

A 5 to 6 out of 10 firmness level is a helpful starting point for most side sleepers. This range is soft enough to let the shoulder and hip settle into the surface, but supportive enough to help keep the body level.
That said, firmness is personal. A mattress that feels medium-firm to one person may feel softer or firmer to someone else depending on body weight, body shape, and sleep preferences.
When you sleep on your side, your shoulder and hip carry much of your body weight. These areas need enough give to sink in slightly so pressure does not build up overnight.
At the same time, the mattress should prevent the spine from dipping too far at the waist or hips. For side sleepers, the goal is a mattress that contours where you need cushioning and supports where you need stability.