The Solid Long Sleeve Zip Mock Neck features IBKUL's patented IceFil technical 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!