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The best mattress topper for side sleepers: cushion the shoulder, keep the spine straight

By the Life in Good Form editors. Updated 2026-10-12.

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Why side sleepers feel a hard bed more

On your side, your weight rests on a much smaller area than when you lie on your back. Sleep Foundation explains that the shoulders and hips bear most of the body's weight against the mattress, which can create pressure points and make existing shoulder or hip pain worse.

The goal is a straight line. In a good side position, the chin and neck sit centered over the shoulders and the shoulders line up with the hips. Sleep Foundation describes both ways to miss it: a mattress that is too soft lets the hips sink and bends the spine, and one that is too firm causes soreness and can leave a gap at the waist.

For side sleepers, Sleep Foundation recommends a medium or medium-firm feel overall, around a 5 or 6 on a 1 to 10 scale. A topper is how you bring a bed into that range.

Signs your bed is too firm for side sleeping

• You wake with a numb or aching arm on the side you slept on.
• Your outer hip or shoulder is sore in the morning and eases as the day goes on.
• You toss and turn from side to side through the night.
• Lying on your side, you can slide a hand easily into the space under your waist.

If instead you feel your hips sinking and your lower back aching, the bed may be too soft, and a softer topper will make that worse. In that case, look at a medium latex topper or our firm topper guide.

How to choose: softness, thickness and material

Softness by body weight. Sleep Foundation's memory foam topper guide says side sleepers generally prefer softer toppers that cushion the shoulders and hips, but side or back sleepers who weigh more than 230 pounds may want a firmer option. A heavier body compresses a soft layer all the way down and ends up on the mattress below.

Thickness. The same guide says toppers of 2 to 3 inches change the feel of a bed more noticeably. For side sleepers on a hard mattress, 3 inches gives the shoulder room to sink. For more on going deeper, see our thick topper guide.

Sleep Foundation's feather topper guide notes that side sleepers may prefer more down for cushioning around the shoulders and hips, while a feather-heavy fill is more supportive. Compare them in our down vs feather guide.

Pair the topper with the right pillows

A softer topper lets your shoulder sink, which lowers your head slightly. Check your pillow height after you add one. Sleep Foundation says side sleepers usually do best with a thicker pillow that fills the gap between head and mattress so the head stays level with the spine.

Between the knees, a small pillow or rolled towel helps. Mayo Clinic suggests drawing the legs up slightly toward the chest with a pillow between the knees to help align the spine, pelvis and hips. See our guides to pillows for side sleepers and side sleeper knee pillows.

Common mistakes

• Going ultra soft at a high body weight. You sink through and lose support.
• Picking a 1 inch topper for a very firm bed. It is often too thin to make a difference.
• Forgetting heat. Sinking deeper into memory foam means less air around you. If you run warm, look at latex or open-cell foam.
• Ignoring a sag. A soft topper over a dip deepens the dip.

What to look for when you buy

Questions people ask

What firmness topper is best for side sleepers?

Usually soft to medium, so the overall bed lands around medium. Heavier side sleepers may need medium rather than soft.

Is memory foam or latex better for side sleepers?

Memory foam contours more deeply; latex cushions with more bounce and sleeps cooler. Both work if the softness is right.

How thick should a topper be for a side sleeper?

Two to 3 inches on a firm bed. Thinner toppers may not give the shoulder enough room to sink.

Can a mattress topper help shoulder pain from side sleeping?

It may help if the bed is too firm, since the shoulder bears much of your weight on your side. Shoulder pain that lasts or limits movement needs a doctor's look.

Should side sleepers use a knee pillow too?

Many find it helps. A pillow between the knees helps align the spine, pelvis and hips, according to Mayo Clinic.

Sources

• Side Sleeping: Which Side Should You Sleep On? (www.sleepfoundation.org/sleeping-positions/side-sleeping), Sleep Foundation
• Best Memory Foam Mattress Toppers (buying guide section) (www.sleepfoundation.org/best-mattress/best-memory-foam-mattress-topper), Sleep Foundation
• Best Feather Mattress Toppers (buying guide section) (www.sleepfoundation.org/best-mattress-toppers/best-feather-mattress-topper), Sleep Foundation
• Sleeping positions that reduce back pain (mayoclinic.org), Mayo Clinic

Sources checked 2026-10-12.