Gym Mattress What Do They Call The Really Thick Gym Mattresses Used In Gymnastics For Landing On From A Height?

What do they call the really thick gym mattresses used in gymnastics for landing on from a height? - gym mattress

Calling the 8 inch. Since this is an 8 inch tall! are not really that soft, but better than the decline in INCHER 4th Among the wounded, very badly. I would be in the middle of a swollen "mat. These are 48 cm high!