The Men's BugsAway Tarka Long-Sleeve Shirt is a comfortable, quick-drying knit that repels bugs, wicks sweat, and features built-in UPF-20 sun protection. Its bug-blocking Insect Shield treatment gives you the invisible, odorless protection of Permethrin and lasts up to 70 washes. Features Insect-repelling BugsAway technology provides protection from mosquitoes, ticks, fleas, and other bugs; Odorless, invisible built-in treatment lasts up to 70 washes Bluesign Approved Fabric Ultraviolet Protection Factor (UPF) 20 SILVADUR antimicrobial finish for odor management Lightweight, quick-drying and wicking polyester Forward-rolled shoulder seams for abrasion resistance Specs Fit: Natural Main materials: 100% Polyester Center back length: 28.5in Weight: 0lbs 2.82oz (79.9g)