BSN Jobst Gelocast Unna Boots are impregnated with zinc oxide and calamine to soothe irritated skin. This nonraveling gauze is uniformly coated so that it is easy to handle and can mold to the limb, providing a semirigid case that is ideal for immobilization of strains and sprains. When used in the management of venous stasis ulcers, it provides a high working pressure and lower-resisting pressure to reduce edema and improve venous hymodynamics. Made of 100% cotton.