A super-cooling tech polo with stretch and sun protection, this soft and lightweight shirt sports industry-leading cooling technology, which reacts with your sweat to lower the material’s temperature and keep you cool during dynamic aerobic activity in the heat. Columbia Men's PFG Zero Rules Polo 100% polyester Omni-FREEZE ZERO interlock knit Rib knit collar and 3-button placket with dyed-to-match buttons Short sleeve open hem Double needle and flatlock stitching for durability Columbia PFG heat transfer logo on the left chest Omni-SHADE UPF 30 sun protection Antimicrobial Machine wash