Sleep Master iCoil 10 Inch Spring and Gel Memory Foam Hybrid Mattress, Twin Gel Memory Foam for pressure relieving cool comfort Foam encased iCoil pocketed springs provide customized support The iCoil technology ensures motion separation for an uninterrupted nights sleep Only the highest quality of foamfoam is CertiPUR-US Certified for durability, performance, and content Smartly shippedour patented technology allows our mattresses to be efficiently compressed, rolled and shipped in a box conveniently to your door