the Fomentek Bag is a simple, safe, effective, and special double-ply bag that can hold hot or cold water to ultimately heat or cool the human body. Hot water and cold water treatments are known to help alleviate and relieve a variety of ailments and symptoms.  The thin and sturdy translucent water bag is filled directly from your tap water supply. Two durable, ultra-thin polymer layers provide strength while remaining pliable and “soft” to the touch and is able to amazingly conform to body curves.Our bags are BPA-Free, Latex-Free, Phthalate-Free, Odor-Free, Non-Allergenic, and Non-Toxic so the whole family can use them.