AS X Alternating pressure system for the treatment of pressure ulcers up to grade III (according to EPUAP). The ASX mattress overlay features nylon/PU cells, eight of which are micro-perforated. The cover is bi-elastic, PU-coated and has an all-around zipper. In addition, a double layer bottom permits the insert of a mattress base up to 5 cm. This feature protects the existing mattress from soiling.