The day heats up but you don't. How is this possible? The lightweight technical fabric used in this quarter-zip jacket is a blend of recycled polyester and Ice Cool® nylon, a fabric that works to transport moisture and heat away from the skin, effectively lowering your body temperature and keeping you cooler. This is an ideal layer to guard against sunburn thanks to a taller collar and UPF 25+ protection. A close fit and no seam beneath the armhole optimizes performance and range of motion. Polyester/nylon. Washable. Imported.