Comfortable and flexible fit. Mechanical Stretch Poplin, 65% Polyester/35% Cotton. This shirt ventilates and cools which provides relief from heat exposure. Easy care stain release. Moisture wicking. Flex fabric for comfort and mobility. Color retention wash after wash. Back and underarm mash venting for cooling comfort. The Dickies Worktech shirt offers ventilation in key areas with breathable performance mesh, designed to bring in air and move heat away from the body. The built-in evaporation zones provide relief from heat exposure.