Merrell Opti-Wick fabric transfers moisture away from your skin and dries quickly to keep you comfortable. 100% polyester. Merrell Ionic. Soft and stretchy fabric wicks moisture, dries quickly and offers everyday performance that feels great. UPF fabric. Merrell N.A.D.A. dye-free colorway option. Three quarter sleeve. Flattering overlapping shoulder binding detail. Open placket with binding pops and flatters. Topstitching detail throughout.