These Mil-Spec butyl rubber gloves have the highest permeation resistance to gas, chemical agents and biological hazards of any glove compound available. They are 25 mil thick and designed to be used with chemical protective suits for protection against chemical and biological agents, including anthrax, nerve gas or mustard gas. The package includes a cotton inner liner and the special outer glove, as pictured. Just put them on and use some duct tape to tape them to your suit, and your hands are in good hands.