What Our Gearhead(R) Experts Are Saying: "I've worn the Swift Cap on everything from hot summer trail runs to exposed alpine hikes-it's breathable, packs down easily, and stays put even when I'm moving fast. The dark brim cuts glare, and I never feel overheated under it."When the sun's high and the miles are long, the Swift Cap is the lightweight shield we trust. Outdoor Research crafted this ultra-breathable cap with recycled bluesign(R)-approved nylon that wicks moisture, dries fast, and delivers reliable UPF 40+ sun protection. Whether we're logging trail time or pushing up a ridge, it keeps us covered without adding bulk. We love the thoughtful touches: the dark underside of the brim reduces glare, mesh panels increase ventilation, and a TransAction(TM) headband manages sweat when the pace picks up. The low-profile fit slides easily under a helmet for alpine missions or bike rides, while the adjustable back buckle dials in a secure fit on the fly. At just 2. 5 ounces, it disappears in our pack but stands up to the toughest conditions.