Ultralight, Breathable, UPF 40 Sun Protection for Trail Running and More The Swift Cap features a bluesign approved recycled nylon blend that's highly breathable, water resistant, quick drying, and delivers UPF 40 sun protection for trail running and warm-weather hiking. The Swift's shaped brim and nylon panels protect the face and eyes from the sun, and its low profile fits perfectly under a helmet for alpine climbing and ski touring. Weighing in at a scant 2.5 ounces, it's ideal for the ounce-counting backpacker and thru-hiker. The dark fabric under the brim helps reduce glare, while mesh panels ensure superior breathability. A quick-release back buckle allows for on-the-fly adjustment, and the moisture-wicking TransAction headband keeps perspiration off the face and eyes. A breathable, lightweight, and water-resistant hat that will keep you cool and comfortable in the summer heat, the Swift Cap is an essential choice for active warm weather wear or long days on trail.