Keep the buzz to a minimum with the Boonie Hat from Stetson. Durable nylon construction. Mesh inset allows for breathability. Drawstring and toggle closure at the back of hatband allows for a custom fit. 2 1/2??? Brim. Adjustable wind cord features a toggle closure. Fold away fabric shield blocks the wind and sun from your ears and neck. NO-FLY ZONE insect repellent technology works as a contact insecticide effective against mosquitoes, ticks, ants, chiggers, flies, and midges.