Oidon Military Boonie Bush Hat Snap Brim Hat Sun Cap with Adjustable Chin Strap Two snap buttons help changing to another style hat Four ventilation holes keep the hat ventilate Best Fit From 22.83" (58cm) - 24.01" (61cm)Head Circumference Portable and foldable, fit for Outdoor Hunting Fishing etc. 2.75"(7cm) brim, 4.33"(11cm)hat depth