9 oz., 50% cotton, 50% polyester Eco® fleece fabric is soft and durable; Made with up to 5% polyester from recycled plastic; Coverstitched seams throughout for better durability; Sideseamed construction won’t twist and bind; 1x1 rib with spandex at cuffs and waist won’t sag over time; "C" logo above left cuff – the mark of true athletic performance;