Bought to lay under a mattress in a hardtop, rooftop tent. Perfect size for mattress and to lap up sides slightly on edge of tent base. Easy to get through window flaps, lay, mark and cut with wall paper scissors. 10mm high, light weight and the mat provides additional bounce for mattress, covers over any bolt heads on base floor, feels warm to the touch and springs back in to shape after being pressed down This will definitely facilitate air flow under mattress. Cut like wall paper. Overhang can easily be trimmed to suit once cut and layed roughly in to position A perfect buy!