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Columbia's Insect Blocker Plaid Shirt features the outdoorsman's trifecta of performance: Insect Blocker technology wards off bugs, UPF 30 shields you from harsh UV rays, and Omni-Wick moisture management keeps you cool and dry during dynamic activity.. . . Polyester and nylon fabric with Insect Blocker. Insect Blocker technology uses naturally occurring chemicals to ward off biting insects (mosquitoes, ticks, flies, and other biting insects). Omni-Wick technology actively breathes and pulls sweat away from your body to keep you dry and cool. Omni-Shade UPF 30 provides premium protection from the sun. Pocket with hook-and-loop closure. Mesh pocket bags. Roll-up sleeves with tab holders. Sun protection collar. Vented to help keep you cool. Modern Classic Fit: Universal, easy fit for comfortable range of motion.