Ultralight, Breathable, UPF 40 Sun Protection for Trail Running and More The Swift Cap features a bluesignA(R) 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. Specs bluesignA(R) approved 60% Recycled Nylon 40% Nylon Shell 100% Polyester Mesh Weight: 2.5 oz/ 71 g Origin: Vietnam Features Fabric Performance: Water Resistant Breathable Lightweight Wicking Quick Drying TransAction(TM) Headband UPF 40 Design Features: Stiff Curved Brim Dark Fabric Under Brim Mesh Panels Quick Release Buckle Back Reflective Logo - Only when reflective is in color name