100% Polyester Imported Button closure OMNI-FREEZE ZERO: Blue rings react with sweat to lower the temperature of the fabric so you feel cooler, while it wicks away moisture. OMNI-SHADE: 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. COOLING BUTTON-DOWN: Sweat-activated super-cooling technology, wicking fabric, and built-in sun protection make this collared shirt ideal for hot, sunny days. HANDY FEATURES: Made from quick drying polyester this shirt includes a multipurpose chest pocket with utility loop, and strategic venting in the back for true functional style. BUILT TO LAST: 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 will enjoy for seasons to come.