The Iona hat is an exaggerated soft bell shape that can be adjusted throughout the day. It's a sun hat and a rain hat. Brim can be worn up or folded down for additional protection. 100% Nylon Flight Satin Small 22.5" Inner CircumferenceMedium 23.5" Inner Circumference Crown Height 3.5”Brim Length 4.25” Handmade in New York