Zappos.com is proud to offer the Outdoor Research - Prismatic Cap (Fossil) - Hats: Dodge every curveball Mother Nature throws at you with the versatile Prismatic Cap. ; 70-denier GORE-TEX shell provides waterproof, breathable protection. ; Fully seam taped. ; Soft tricot lining. ; Drawcord adjustment for sure fit. ; Zip-off ear flaps. ; Hidden earphone pockets. ; Shell: 100% nylon. ; Lining: 100% polyester. ; Machine wash cold and hang dry. ; Circumference: 23 in ; Product measurements were taken using size L. Please note that measurements may vary by size.