5-ounce 60% polyester 40% Cocona 37.5 polyester. FastDrt with 37.5 technology makes this our fastest druing gear. Fights odors, traps and releases them into the wash. Gusseted side panel for ease of movement. Half-zip with mock-neck. Carhartt heat transfer label on left chest. Tagless neck label. Smooth flatlock seams.