The Optimo packable hat has a straight crown a ridge down the center that allows it to be folded in half and rolled up for packing. The brim is 5" woven edge, please note that the brim length can vary up to an inch. The wide brim is great for sun protection, and will develop a wave if kept rolled. To straighten, simply store the hat on a flat surface or use a steam iron to flatten. Size M - 22.5” New / Never Worn Hand blocked in Portland, Oregon.