SLEEPLACE 10 Inch Encased Coil Hybrid Spring Mattress OM02 (King) Poly Imported Multiple layers combined - dura Coil 7.5" + duraflex 1" + i-gel 1" + hdr foam 1" Dura-coil technology - 7.5 inch heat treated Coil maintains mattress firmness constantly Dura i-gel foam/ dura Flex foam - Eco friendly foam structures help you sleep better in proper temperature Had foam - high density foam absorbs and disperse your weight Smart shipping - efficiently compressed, rolled and shipped in a box conveniently to your door