Tactical Head Wear/Boonie Hat Cap For Wargame,Sports,Fishing & Outdoor Activties 60% Cotton + 40% Poly Imported Block out 98% of harmful UVA and UVB rays Four vent holes keep your head cool. Side Eyelids and Pop-in Button for Easy Conversion to Sheriff / Cowboy Style Boonie Hat. Inner Diameter: 7.5". Fit Size L/XL (Head Circumference: between 22.5" and 24") Super light and fully flexible, this hat is foldable. So it is very convenient to take it anywhere.