Cold Pruf - Mens Performance Base Layer Performance Crew Top, Black, Flat Seams, Tagless, Ribbed Cuffs, Extended Tail, Moisture Management Fiber, Wicks Away and Evaporates Moisture and Controls Odor, Weather Cold to Very Cold With Medium to High Activity, Chest Size S = 34-36 Inches M = 38-40 Inches L = 42-44 Inches XL = 46-48 Inches 2XL =50-52 Inches, 96% COLDPRUF Performance Polyester 4% Spandex, Made In Mexico Of USA Components, #29927 29-927