This classic ball cap has an embroidered ExOfficio design and an adjustable back strap to customize the fit. It also protects from sun and bugs with a UPF 30+ rating and Insect Shield® technology. Permethrin, the active ingredient in Insect Shield, is invisible, odorless, and so tightly bonded to the fabric fibers that it retains effective repellency through the life of the garment. It repels mosquitoes (including those carrying West Nile virus and malaria), ticks, ants, flies, chiggers and midges (no-see-ums). Insect Shield repellent lasts through 70 washings. Do not dry clean.