The Essential LS Zip Top is designed with IceFil technology fabric that converts sweat to refrigerant; cooling your skin 3 to 5 degrees & keeping you cool, comfortable, and dry on the hottest days. This garment 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 on the course, to the store or to any athleisure activities!