Milwaukee designed their Black Workskin Lightweight Performance Short Sleeve Shirt for tradesmen who need a next-to-skin layer that dries fast， stays cool and protects from harmful UV rays. The Milwaukee Workskin is made from moisture-wicking fabric that stays dry. The 100% polyester material dries fast and resists wrinkles， unlike standard cotton base layers. The relaxed fit and raglan sleeves allow mobility to accomplish any task for comfortable all day wear on the jobsite.