Study finding
87% of chronic low back pain patients report sleeping in a side-lying position, with 92% experiencing sleep difficulties due to back pain
Source: Central Hospital of Central Finland - Sleep Position StudySide Sleepers · Knees · Hips
Side-sleep in comfort, with your knees gently apart.
4.7 3 reviewsSide-sleeper knee cushion with a stay-put strap
When you sleep on your side, the top leg can drop forward. This orthopaedic side sleeper knee pillow sits between the knees to add cushioning and keep the legs more comfortably spaced overnight.
A built-in adjustable leg strap helps the cushion stay in position so the support does not slip away while you sleep.
Choose your preferred filling
Designed for everyday comfort and support
Product features and specifications
UK delivery usually takes 2–4 calendar days from ordering, including processing and weekends. Delivery is free on orders of £39 or more, or £5 below that. Check the estimated delivery dates beside the price for this item.
Contact us within 14 days of delivery, then send the item back within a further 14 days. You pay change-of-mind return postage; we cover return postage for faulty, damaged or incorrect items. See our refund policy for full conditions, including inspection rights, hygiene-seal exceptions and refund timings.
The options are Original Foam — Soft, Memory Foam — Soft and British Wool — Medium. Foam cores have a fixed amount of filling; the wool filling can be adjusted. Select the option to see its price.
The listing includes a removable, washable 100% cotton cover with an adjustable strap. Check the selected filling and follow the supplied care instructions.
Place it between your knees while resting on your side. Adjust it for comfort, and use the strap loosely if it helps keep the cushion close to your leg. It should not restrict movement.
The approximate listed dimensions are 23 × 15 × 9.5 cm. The working thickness depends on the filling and how it compresses; these dimensions do not prescribe a particular gap for your knees.
Remove the outer cover and follow its sewn-in care label. Let it dry fully before refitting. Do not assume the filled pillow is machine washable.
It provides cushioning while resting. It does not diagnose the cause of pain or guarantee relief. Seek healthcare advice if symptoms persist, worsen or interfere with sleep.
Compare the fillings in our knee pillow buying guide or browse the knee pillow collection.
87% of chronic low back pain patients report sleeping in a side-lying position, with 92% experiencing sleep difficulties due to back pain
Source: Central Hospital of Central Finland - Sleep Position StudyClinical research recommends side-lying with supportive alignment to reduce low back pain, noting that proper pillow support between knees can help maintain spinal neutral position
Source: Musculoskeletal Care - Systematic Review, 2025Try lying on your side with a pillow between your knees. Sleep in whichever position is comfortable for you, using pillows to support your body and maintain alignment.
UK public health guidance, General sleep-position advice, not an endorsement of this productThese studies concern the wider product category or design principle and may not have tested this exact product. Individual results may vary. These products are comfort supports, not medical devices, and they are not NHS-approved.
Consult a healthcare professional for personalised medical advice.British comfort specialists
Second-generation, family-run British manufacturer with decades of experience creating practical comfort and positioning products.
Silent workshop footage: fabric is sewn, foam is cut to shape, and finished Putnams products are wrapped and packed.