OLLIN1 PREMIUM Mens Active Short Sleeve Button Up Baseball Jersey Shirt OLNMT1321: 100% Cotton / OLNMT1572: 100% Polyester OLNMT1321: Heavyweight cotton material provides comfort and wamth on chilly days / OLNMT1572: Soft, lighter material for all-day comfort Button down closure / OLNMT1572: Color block stripes for a sports inspired look Double stitching on bottom hem and sleeves / Curved hemline Wash dark colors separately in cold water / Do not bleach / Tumble dry low Please look at the measurements below for guidance