The pocket reflex 2000 uses 5cm of high density reflex foam that provides a firmness that gives you extra body support that you require the pocket reflex 2000 mattress has a boundary made of reflex foam around the springs to prevent you from rolling off the mattress while you sleep the springs are individually wrapped that creates a system that provides you with extra comfort mattress comes complete with a beautiful cover which is zip off and dry cleanable specification 5cm high density foam