The REI Fitness Runner's cap shields your face from rain and sun while you're out logging your daily miles. Nylon exterior combines with polyester mesh panels for great ventilation. Polyester headband wicks moisture away from your brow and speeds the evaporation process. Reflective detailing increases your visibility in low light. REI Fitness Runner's cap has a rip-and-stick strap in back that lets you adjust the fit 1 size fits most.