This one-piece waterproof slip-on thong sandal is made of lightweight EVA and has a contoured footbed. The arch support is more subtle than the Birkenstock Papillio and Classic footbeds. The regular width is not quite as wide as the Birkenstock Classic footbed regular width, so some people may need to order a size larger. Those with wide feet may be more comfortable in a Classic Birkenstock. Newalk made by Birkenstock.