Arizona EVA Regular, Ultra BlueFor the Arizona EVA, the ergonomic comfort of the original Birkenstock footbed is constructed from waterproof, shock absorbing EVA material. These are the only shoes you'll need all summer long, and they float too! Width and Sizing: Birkenstocks styles are unisex, and the footbed has extra room. The narrow fit are usually more suited to womens feet. See the size chart Regular: Women's width equivalent: C D Men's width equivalent: D EE Men's Sizing: EU