Design: Back strap for added security Two adjustable straps with buckles for a custom fit In-Shoe Comfort: Birkenstock(R)footbed offers arch support, a deep heel cup, and a roomy toe box Flexible, lightweight, durable and shock absorbing EVA outsole Additional Details: Sizing tip: The fit of this style is a medium width but may be listed by Birkenstock(R) as narrow. Care instructions: Wipe clean with mild soap and water.