Hawke & Co Men's Performance Pique Zipfront Polo Shirt 50% Polyester/50% Cotton Machine Wash Hk stretch comfort flex - provides free motion & flexibility. It decreases tension and allows for free flowing movement Coolest ii - equipped with a cooling powder, which absorbs heat slowly abd dissipates heat quickly. Hk microbial guard - an it-microbial fabric prevents the growing of a broad spectrum of bacteria Hk uv protection