This Chemical Protective Jacket is good for working in chemical surroundings with a gas mask or hunting in the Fall. It is the protective wear worn by the U.S. troops when going into harmful territories caused by chemical attack. It is also very warm due to the charcoal acting as an insulator. Hunters love it! Wearing the suit helps prevent detection by animals with a keen sense of smell by locking in the human scent. This is the original scent-blocking jacket, Mil-spec. Has a full liner of charcoal, that works 100%