Knee pillow guide for side sleepers: height, shape and fit

Who a knee pillow for side sleepers helps

When you sleep on your side, the top knee often drops toward the mattress and the legs press together. A knee pillow fills that gap so the knees rest apart.

Cleveland Clinic's low back pain coping tips suggest sleeping on your side with knees bent and a pillow between the knees, or, for back sleepers, pillows under the knees. A knee pillow is simply a shaped, steadier version of that pillow.

It is a comfort aid, not a treatment. If you have hip, knee or back pain, ask a doctor or physical therapist what position and support suit you.

• Side sleepers whose knees knock or press together
• People who already use a regular pillow between their legs
• Anyone wanting a smaller, steadier shape than a bed pillow
• Back sleepers usually need an under-knee support instead
• Pregnant people often use a knee or body pillow; ask your midwife or doctor

Height, shape and size: what to check

Height is the main fit question. A taller pillow suits wider hips and fuller thighs; a shorter one suits a slimmer frame and feels less bulky when you turn.

Shape changes where the pillow sits. Tall hourglass designs reach from the thighs to the knees. Smaller contoured pillows sit between the knees only and are easier to move with you.

Check the cover, too. A removable, washable cover keeps the foam clean, which matters for something that sits against your skin all night.

• Published height, width and depth, if the maker gives them
• Size options, such as standard and large
• Hourglass thigh-to-knee shape or a smaller between-knee shape
• A strap or contour that helps it stay in place
• Removable, machine-washable cover

How the two picks compare

Two knee pillows passed our listing and maker-page checks. The facts below come from each maker's product page, using the same attributes for both.

Contour Living publishes full dimensions; Everlasting Comfort does not. That makes the Contour pillow easier to judge before buying and the Everlasting Comfort pillow more of a size check on the listing.

In practice, the Contour pillow suits people who want a large, steady block between the legs and do not turn often. The Everlasting Comfort pillow suits people who prefer something smaller, change sides through the night, or want the option of a strap.

• Contour Legacy Leg and Knee Pillow: 10 in high, 9 in wide, 6 in deep tapering to 2.75 in; memory foam; hourglass shape; removable washable quilted cover; 1-year warranty
• Everlasting Comfort Knee Pillow: Standard and Large sizes; no dimensions published; CertiPUR-US certified memory foam; OEKO-TEX certified removable cover; lifetime warranty on defects for non-electronic products
• Strap: Everlasting Comfort's Amazon title lists a removable strap; Contour lists none
• Care: both covers come off; Everlasting Comfort says spot clean the foam and air dry it

Using a knee pillow night to night

Place the pillow between your knees or thighs before you settle, then bend your knees slightly. If you turn during the night, the pillow needs to move with you, which is easier with a strap or a smaller shape.

Give it a few nights. Foam pillows can feel firm and unfamiliar at first, so check the return window before you buy in case the height turns out to be wrong.

If you share a bed, a knee pillow takes up little room compared with a full body pillow. Keep it on your own side so it does not end up under a partner during the night.

Your head pillow matters too. On your side, the Centers for Advanced Orthopaedics suggests a pillow that fills the distance from shoulder to ear without forcing the head up, a good starting point for pillow height for neck pain.

• Position the pillow before you settle on your side
• Bend your knees slightly so it sits snugly
• Use a strap if the pillow keeps sliding away
• Allow a few nights before deciding
• Keep it on your own side of a shared bed

Care and storage

Wash the removable cover as the label says, and let it dry completely before refitting. Everlasting Comfort advises spot cleaning the foam core and letting it air dry rather than soaking it.

During the day, keep the pillow on the bed or a bedside chair so it is ready at night. A spare cover makes washing easier if you use it every night.

Replace the pillow if the foam no longer springs back or feels flatter on one side. A pillow that has lost height no longer fills the gap between the knees.

• Machine wash only the cover, following its label
• Spot clean the foam and air dry it
• Air new foam out of the packaging before first use
• Keep it within reach of the bed
• Replace foam that has flattened or lost height

When to ask for personal advice

If you sleep on your side because of a hip, knee or back problem, or after joint surgery, ask your surgeon, doctor or physical therapist which position and support they want you to use. After some operations there are specific rules about leg position.

If pain is new, severe or getting worse, get it checked rather than relying on a pillow.

A physical therapist can also suggest other supports, such as a pillow behind the back or under the top arm, if a knee pillow alone does not keep you comfortable on your side.

• Recovery after hip or knee surgery
• Pain that wakes you or worsens over weeks
• Numbness or tingling in the legs
• Questions about the right sleeping position
• Ask about extra supports behind the back or under the arm