The Adult BIRKENSTOCK Arizona EVA Sandals are this season's must-have summer sandals. Constructed from an ultra-lightweight EVA material, similar to the foam that running shoes are made with, the Arizona EVA Sandals cushion and support your every step. With two adjustable straps, you'll enjoy a more secure fit. Most importantly, rubber BIRKENSTOCKs are waterproof. While the slip-on style makes the BIRKENSTOCK Arizona EVA ideal for the beach or gym, they really can be worn anywhere there's warm weather. Plus, the BIRKENSTOCK Arizona EVA Sandals are durable and flexible for extended wear. Whether you're at the lake or taking a walk around town, wear the BIRKENTOCK Arizona EVA Sandals for maximum comfort.Sizing Tip: The fit of this style is a medium width but may be listed by BIRKENSTOCK as narrow.