Knee pillow guide: foam, memory foam & wool

Which filling should you choose?

Start with how you like cushioning to feel. All three choices on our orthopaedic knee pillow use the same compact, contoured format, with an approximate listed size of 23 × 15 × 9.5 cm. Changing the filling changes the feel and, for wool, how you can adjust the cushioning.

The prices in the product card above update from our live listing. Soft and medium are the product selector’s labels, rather than a measured comfort score. There is no single best filling for everyone.

Which product page should you use?

Use the main knee pillow page if you want to compare the three fillings in one selector. The individual links above open Original Foam, Memory Foam or British Wool already selected, so check that selection before adding to your basket.

If you already want wool, you can also use the natural British wool knee pillow page. This is a separate product listing with one wool option; it does not offer foam or memory foam. Its description focuses on adjustable wool filling, a removable cotton cover and a polycotton strap.

Wool appearing on both pages does not add a fourth filling type. Both product listings are included above so you can choose the one that suits the way you want to shop.

Check the size and fit for side sleeping

Both listings give approximate dimensions of 23 × 15 × 9.5 cm. Those are the outer measurements, not a promise that the pillow will stay 9.5 cm thick under pressure. Foam compresses, and the amount of wool changes the cushioning in use.

Look for comfortable separation between your knees. The pillow should fit your resting position without forcing your legs too far apart. A smaller knee cushion provides local cushioning; it does not replace a full-body support or a bed wedge.

• Choose original foam if you prefer resilient foam cushioning and want the lowest-priced option.
• Consider memory foam if you prefer a material that contours gradually around contact.
• Consider wool if you want a natural filling and the ability to change the amount of cushioning.

Position the pillow and adjust the strap

1. Lie in your usual comfortable side-resting position and place the contoured pillow between your knees.
2. Adjust its position until the cushioning feels comfortable against both legs.
3. Use the adjustable strap to help keep it in place, fastening it comfortably without restricting movement.
4. If you choose wool, make small filling adjustments and spread the remaining wool evenly before trying it again.

The strap helps retain the pillow as you move; it is not intended to hold your legs rigidly. Follow any individual positioning instructions you have been given after surgery or for an existing condition.

Care for the cover and filling separately

Both listings include a removable, washable cotton cover. Remove it before cleaning, follow its sewn-in care label and let it dry fully before refitting. A washable cover does not mean that either a foam core or wool filling can go in the washing machine.

For wool, keep any filling you remove clean and dry if you want to add it back later. The foam versions use shaped cores; do not treat them as loose fillings that can be reduced in the same way.

When a different support may suit you

If you need support around the front and back of the body, read the pregnancy pillow guide. If you want a broad inclined surface for resting, see the bed wedge guide. These shapes serve different purposes from a cushion placed between the knees.

Before you order

Check the filling selected, the current price and availability on your chosen product page. Review delivery and returns before ordering. If you are buying because of persistent pain or a recovery plan, ask your healthcare professional which position and support are appropriate.

This guide uses the specifications and options on our two current product listings, checked on 8 September 2026. It compares construction and practical choices; it does not claim hands-on testing or guarantee a medical outcome.