100% MICRO DENIER JERSEY KNIT POLYESTER 4.3 oz / 146 GSMMoisture wicking performance, Anti-microbial treated for odor control.Taped neck and shoulder seams for durability, Two-needle hemmed sleeves and bottoms won't unravel.3/4" seamless rib knit collar, Tear-away label is easily replaced with yours. Sizes S-2X