Burton Men's Midweight Wool Crew Top 84% Poly 11% Wool 5% Spandex Imported Thumbhole Cuffs Ultra fast-drying and highly breathable drirelease wool blend: 84 percent polyester,11 percent Merino wool, 5 percent spandex Superior wicking action and next-to-skin comfort Chafe-free soft lock seams for comfort Extra long body: strap in without your shirt un-tucking