there are 0ne-piece design and two-pieces design, the film is made of three layers PE high resistant film, EVA or TPE film, the there are 0ne-piece design and two-pieces design,*the film is made of three layers PE high resistant film, EVA or TPE film, the thickness of film is about 0.08-0.12mm, soft, comfirtable, and good odor-reisisting and with low friction noise.* Intestinal gas and odor can ...