When the weather outside isn't doing you any favors, stay motivated with smart layers that work as hard as you do. Our PhD® Light fabric combines the temperature and moisture regulating properties of Merino with polyester for greater stretch and recovery and quicker dry time than Merino alone. Gender-specific mesh panels increase breathability. Two small holes located on back of shirt(pictured) Features Regular Fit Minimal Merrow seam construction provides superior durability and is soft against skin 8.75" (22 cm) center front zipper with chin guard Knit in Vietnam: Body - 56% Merino Wool, 44% Polyester; Mesh - 54% Merino Wool, 46% Polyester Style: SW0SO169