100% Polyester Imported Pull On closure Machine Wash The men's and women's a-safety long sleeved construction shirt is made of 100% highly elastic fluorescent polyester fiber, lightweight, breathable, wash-resistant and durable. With added moisture-wicking function, the surface moisture absorption rate of this men's hi vis shirt is 3 times that of cotton, allowing it to dry quickly and ensuring comfort in the summer, keeping you fresh all day long.