Soft and strong. Carhartt starts this work tee with lightweight polyester and then infuses it with the key features that keep you performing your best: Rugged Flex(R) and gusseted side panels help you move naturally, odor-fighting properties keep you fresh, and FastDry(R) with 37.5(R) technology wicks away moisture to control sweat and help you remain dry during difficult tasks.. . Lightweight & soft, yet durable, 4.7-ounce polyester performs all day to keep you comfortable. FastDry