Desire Beds Micro Quilted Open Coil Sprung Memory Foam Brick Designed MattressThis mattress has been carefully designed and constructed with a European engineered traditional 13. 5 gauge open coil Bonnell spring unit. This is a quality sprung mattress contains a layer of high quality next generation visco elastic memory foam which is activated by pressure and body heat. It supports and hugs your body shape in any position you want to sleep in. When you settle down for a night on one of these mattresses, you will feel supreme