Designed specifically for dynamic aerobic movement on warm days, this cool-wearing, ergonomically cut men's long sleeve shirt features our sweat-activated super cooling technology in the core and top of sleeves to keep you from overheating, as well as Omni-Wick® EVAP side and back inserts for accelerated sweat dispersal where you need it most. The Freeze Degree™ III Long Sleeve Half Zip is stretchy and comfortable, with UPF 30 sun protection and a half-zip chest so you can adjust your ventilation. 92% polyester/8% elastane stretch jersey trimmed with 91% polyester/9% elastane mesh Omni-FREEZE ZERO sweat-activated cooling and Omni-WICK EVAP mesh Contrast zipper stops at a self-fabric chin guard for added style and comfort Mesh insets on shoulders and center back add extra cooling comfort Flatlock stitched seams for durability Heat transfer Columbia logo on the left chest and Omni-FREEZE logo above the hem on the left sleeve Omni-SHADE UPF 30 sun protection Anti-microbial Machine wash