Knee pillow guide: foam, memory foam & wool

The best knee pillow for side sleepers is one that keeps your knees comfortably apart without pushing your top leg too high. Choose memory foam if you like a contouring feel, original foam for resilient cushioning, or British wool if you want to add or remove filling. All our knee pillows include a strap so the pillow stays between your knees when you turn over.

Three: original foam (soft), memory foam (soft) and British wool (medium). All three are on our orthopaedic knee pillow. If you only want wool, there is also a separate British Wool Knee Pillow.

Both are about 23 × 15 × 9.5 cm, filled with British wool that you can add or remove, with a removable cotton cover and a leg strap. The orthopaedic knee pillow lets you compare wool with the two foam fillings in one place; the British Wool Knee Pillow is a wool-only product page.

Both feel soft. Original foam is light and springy and keeps its shape; memory foam softens with your body warmth and moulds around your legs. Choose the feel you prefer.

With wool, yes: unzip the inner core and add or remove wool until the thickness feels right. The foam fillings are a fixed shape, so their thickness cannot be changed.

Enough to keep your top knee roughly level with your hip when you lie on your side. Our knee pillows are approximately 9.5 cm deep before compression. If you have wider hips or prefer more lift, the British wool option lets you add filling; if it feels too high, remove some.

Yes. Placed under the knees, a knee pillow gives a small bend at the knee that many back sleepers find more comfortable. For a longer support under both legs, compare our leg rest, which is designed for use under the lower legs.

Choose a knee pillow that keeps your top leg supported at hip height, so it does not drop across your body. A strap helps it stay in place through the night. A pillow provides cushioning, not treatment; if you have persistent hip pain, ask your GP or physiotherapist which sleeping position suits you.

Both listings include a removable cotton cover and an adjustable leg strap. Position the pillow between your knees and fasten the strap comfortably, without restricting movement.

Wash the removable cover only, following its care label, and let it dry fully before putting it back on. Do not put the foam or the wool filling in the washing machine.

A knee pillow provides cushioning and helps keep the knees comfortably separated. It is not a guaranteed treatment. If you are choosing support for an ongoing condition or following surgery, follow the positioning advice given by your healthcare professional.

Yes. Leg pillow, knee cushion, leg separator and knee pillow all describe a cushion between the knees or thighs for side sleeping. A long body pillow is different: it runs the length of your legs. Both of our knee pillows are the small contoured type, about 23 × 15 × 9.5 cm, with a strap.

For sleeping, usually yes. Without a strap the pillow slides away when you turn over and you wake up hunting for it. Both of our knee pillows have an adjustable strap; fasten it loosely around the thigh. For a daytime cushion under the knees, a strap does not matter.