Clamshell Brim Packing made easy! Our Clamshell Brim allows you to safely fold your hat in half for compact packability. Mesh Ventilation Keep your head cool and protected with our mesh ventilation. Tech Sweat Liner Generous sweat band to pull moister away from you head leaving you cool and ready for whats around the next bend. Adjustable Sizing Pick your size, then fine-tune the fit with our exterior size adjuster. UPF 50+ Sun Protection It's hard to beat the enjoyment of a day in the sun, unless it's a day spent in the shady pleasantness of a UPF 50+ hat. A rating of UPF 50+ is the highest sun protective rating achievable and means only 1/50th or less of UV rays are able to pass through, allowing you to diminish the sun, not the fun! Description “This hat turns a neat trick: Top-mounted vents can be flipped open on exceptionally hot days or left closed if you want full protection from the sun. The curved lines on the side make it comfortable on long runs, and it doesn't interfere with sunglasses. The foldable bill dials up usefulness, so you can pack it flat in your gym bag—or tuck it in the waistband of your shorts, if you need to ditch it mid-run.” — Runner's World We wanted an ultimate performance cap, so we crammed a bunch of our favorite technologies into the Eclipse. Our Convertible Ventilation system covers for sun protection and opens up when airflow is needed. The Clamshell Brim lets you stow it away in your back pocket or the farthest reaches of your suitcase. Ear-friendly design keeps you comfy until the end of the road. Features & Specs 3" folding Clamshell Brim UPF 50+ Certified Sun Rating (mesh vents not rated) Convertible Ventilation High performance wicking microfiber 100% Recycled, Wicking Fabric Integrated Wicking Sweatband Liner Adjustable Sizing Ear-friendly Profile Designed in USA/Imported Patent Pending Weight: 2.2 ounces/62.4 grams Care & Content How to pack your hat How to care for your hat Fabric content: 100% polyester, Mesh Ventilation: 100% polyester Washing and care instructions: Hand wash cold, line dry. Do not bleach, iron, or dry clean. Packing instructions: Brim folds for compact packing