Supported by a thousand 8 - inch pocketed coils, a foam encased side wall system for edge to edge support, a cool to touch Repreve cover with Ultra Fresh - Anti-Microbial Safeguard Fibers and gel infused foams in the surface quilt, on top of a full inch of performance foam, half an inch of gel comfort memory foam and a full inch inch of extra firm high density foam to keep this as one of our firmest, most durable mattresses backed by the King Koil 10 year warranty.