Read more Designed to perform, made to protect. UPF 50 tech works to block and shield you from harmful UVA and UVB sun rays. Our exclusive blue rings react with perspiration to lower the temperature of the fabric so you feel cooler, while it wicks away moisture. A short sleeve tee designed for an active fit, includes an antimicrobial treatment, for ultimate comfortability on extreme adventure. Columbia’s attention to detail is what sets our apparel apart from others. We use only the highest quality materials, expert craftsmanship, and durable stitching. This is a long-lasting shirt you're sure to enjoy for seasons to come. Read more Omni-Freeze ZERO | Skin Cooling System Omni-Freeze ZERO fabrication lowers the material’s temperature with a cooling fabric featuring blue rings that react with sweat to lower the temperature of the fabric to keep you even more comfortable. Omni-Wick | High-Performance Wicking Fabric The ultimate moisture management technology for the outdoors. Omni-Wick quickly moves moisture from the skin into the fabric where it spreads across the surface to quickly evaporate—keeping you cool and your clothing dry. Omni-Shade | Sun Protection Be safe and protected. Omni-Shade blocks UVA and UVB rays to help prevent sunburns and long-term skin damage. The tight weave construction with UV absorbent yarns block the full spectrum of harmful UV rays. Omni-Freeze ZERO Omni-Wick Omni-Shade (function(f) {var _np=(window.P._namespace("AplusModule"));if(_np.guardFatal){_np.guardFatal(f)(_np);}else{f(_np);}}(function(P) { // register javascript with unique module id P.when("jQuery", "AplusModules-module-6", "ready").execute(function($, hoverModule) { hoverModule("aplus-module-6-2"); }); })); Neck 15–15.5" 16–16.5" 17–17.5" 18–18.5" 19–19.5" Chest 35–38" 38–41" 42–45" 46–49" 50–53" Waist 29–32"" 32–35" 36–39" 40–43" 44–47"