A base of polyurethane foam is lined with visco elastic memory foam making this a supremely comfortable yet supportive product. - Ideal for use whenever the danger of a pressure area exists - Multi stretch waterproof / VP cover - Size: 61cm long (21"). If this product is showing as out of stock (red dot), please note that as we manufacture this product on site it can normally be manufactured and available within 2/3 days of receiving your order.