This memory foam cushion provides exceptional and unrivalled value for money - A base of high resilient polyurethane foam provides stability and support - Whilst a bonded upper layer of visco elastic memory foam provides the comfort and pressure relief required - The memory foam conforms to the user's body, providing continuous and even pressure distribution - Supplied with Harley Dartex waterproof / VP cover - Other options available. Suitable for patients up to medium risk (with appropriate nursing care).