This long sleeve zip mock neck features patented icefil technology fabric. It works by converting sweat to refrigerant; cooling your skin 3 to 5 degrees, allowing you to be cool, comfortable, and dry on the hottest humid days. this garment also has built-in upf 50 sun protection, moisture-wicking, and anti-microbial properties. This style has a mesh underarm panel promoting additional comfort and breathability. Wear the long sleeve zip mock neck to all athleisure activities!