Wet-weather protection comes in a package designed to stay flat in gale conditions with the Force 9 Sombrero by Outdoor Research. Waterproof and breathable. Seam-taped construction for added durability. Tricot lining helps manage moisture to keep you dry and comfortable. Rear crown opening for added ventilation. Brim secures to magnetic attachments on the crown. Removable chin cord. External adjustments offer a snug fit. Rigid foam brim stays flat in high winds. Foam-lined brim floats for convenience. Materials : 70D GORE-TEX Pro Shell fabric. 100% nylon brim. 100% nylon lining. Measurements: ; Circumference: 23 in ; Product measurements were taken using size SM (6 7/8). Please note that measurements may vary by size.