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. 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 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 SIZE GUIDE