Designed for cool comfort and functionality over the long haul, this performance button up is crafted from ultra-light ripstop fabric that's wicking and sun-shielding, with mesh-lined venting at center back. Omni-Shade, Omni-Wick 100% polyester ripstop. Omni-Shade UPF 40 provides maximum protection for long hours in the sun, Omni-Wick technology actively breathes and pulls moisture away from your skin, mesh-lined vent at center back, modern classic fit, antimicrobial treatment protects this shirt from bacterial growth. Material: Polyester.