SAVVY FISHING SHIRT FOR FIGHTING HARSH SUN, HUMIDITY, AND HATCHES THAT BITE BACK. Simms' BugStopperÂ® long-sleeve blocks sun, dries quick, wicks, and fights swarms thanks to advanced InsectShieldÂ® tech. A polyester-nylon blend with two zip-secure, fly-box compatible chest pockets. Articulated elbows enhance mobility. And a sunglass chamois inside the bottom hem keeps optics clear. Traditional fit comes standard. Quick?drying, wicking & UPF 30. Insect ShieldÂ® repellent apparel provides long-lasting, effective and convenient personal insect protection. The active ingredient in Insect ShieldÂ® is so tightly bonded to the fabric fibers that it retains effective repellency throughout the lifetime of the product. This is well beyond the lifecycle of most other products on the market which typically last only a number of washes. FABRIC TECH: 65% polyester/35% nylon APPROX. WEIGHT: 10 oz.