Oasis Shirt - Sun Protective & Insect Repellent Shirt (White, Large) 30+ UPF/ 96.7% UV blocked 100% Nylon with Insect Shield. Insect Shield repels mosquitoes, ticks, black flies, chiggers, no-see-ums and ants. Rugged construction, quick dry and packable. Tabs to secure rolled up sleeves. Mesh underarm and side panels for maximum ventilation. Two front pockets with button closures