Simms BugStopper SunSleeve ensures superior protection from sun and biting bugs thanks to UPF50 SolarFlex stretch fabric with Insect Shield Technology. Slide in while wearing short-sleeve shirts and source ultimate comfort via lightweight, quick-dry, breathable construction. Elastic at the biceps bolsters fit. Curved articulation at the cuffs enhances hand coverage. And pairing snaps simplify storage.