Meca overgloves have been designed to be worn over normal mechanics gloves when extra protection against heat is required. Use with your own gloves for added heat protection Knuckle protection reduces the risk of "key rash." The shock absorbing foam layer is ideal when using impact wrenches. Sparco Mecha overgloves are made from a fire retardant material with fire proof silicone inserts. They are ideal for mechanics who only need occasional heat protection. They can be quickly and easily slipped on over mechanic's gloves when needed.