SmartWool Men's PhD Light Zip T Body: 56% Merino Wool, 44% Polyester; Mesh: 54% Merino Wool, 46% Polyester Knit in Vietnam Regular Fit Warmer Merino/polyester blend ensures fabric moves moisture, dries quickly, and maintains its shape in high-sweat activites in colder weather Minimal Merrow seam construction provides superior durability and is soft against skin 13.8" (35 cm) center front zipper with chin gaurd. Style:SW0SO934