Milwaukee Workskin Men's Large Black Long Sleeve Base Layer Shirt. Base layer Workskin Collection, crew neck shirt. Built to fight sweat, engineered with a custom sweat-wicking fabric and a brushed fleece interior, it keeps you dry and warm. Complete with 4-way stretch, this long sleeve base layer shirt is designed for next-to-skin comfort to layer easily in cold weather conditions. Milwaukee Workskin products are developed in collaboration with feedback from users across the trades through continuous jobsite research.