3-part foam construction relieves pressure and prevents bottoming out. - Firm foam base fused to a middle layer of high-density polyurethane foam for comfort and stability - Top layer of ultra visco elastic memory foam offers hugely improved pressure reduction and relief - Supplied with Harley Premium Dartex waterproof / VP cover - welded seams, anti slip base - Other options available. Suitable patients up to high risk (with appropriate nursing care). 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.