100% polyester face plaited to 60% polyester 40% cotton back (total overall garment 61% polyester, 39% cotton). Dual-sided mesh pique knit wicking polyester on the outside and soft-as-cotton wicking blend on the inside. Moisture-wicking performance with UV 15-39 protection. Matching flat-knit collar. Stylized open placket. Curved back yoke with center pleat. 5 oz.