FOAM ACE is a light mattress wick material that gave the profile processing as for the polyethylene foam with the closed cell structure.
I will reduce the load to the waist as foam because it is hard. The mattress of a new feeling of the relief structure can be made.
Because a FOAM ACE has moderate hardness, it doesn't become a waist breaking. It is the best for one with a bad waist.
Each bubble is an inflatable cushion because of the closed cell structure.