Bedding: Get a cool blue memory foam 3D mattress. Comfort: Designed with a medium firm comfort rating, aiming to promote good blood circulation and relieve pressure points. Design: 13.5 open coil bonnell spring for a longer life. Safe: Hypo allergenic and fully compliant with all UK fire regulations. Mattress depth: 25cm / 9-10". Sizes: Choose from small single to super king (see Full Details). Cool Blue Memory Foam 3D Mattress | Living Social