Columbia Mens Chiller&iquest; Short Sleeve Shirt 100% Polyester Imported Columbia Men's Size Chart It's not a good day unless you've worked up a nice sweat, but rising temperatures can take you out of the game like that. Keep your cool and in the workout longer with the sweat-activated cooling tech of the Chiller&trade; T-Shirt. Active Fit is a silhouette that runs close to the body while maintaining freedom of movement. ZERO performance fabric:&#8226; Omni-Freeze ZERO&trade; tech uses a specialized, blue-dot treatment that lowers skin surface temperature while wet.&#8226; Omni-Wick&trade; tech transports perspiration away from the skin to dry quickly.&#8226; Omni-Shade&trade; UPF 50 fabrication protects your skin during outdoor activity by blocking harmful Ultraviolet A and Ultraviolet B rays (UVA and UVB). Mesh side and lower back panels dump excess heat. Crew neck. Short raglan sleeves. Straight hemline. Logo print at the chest. 100% polyester. Machine wash and tumble dry. Imported. Measurements: Length: 28 in Product measurements were taken using size MD. Please note that measurements may vary by size.