The rugged Outdoor CE collection by Birkenstock is for trekking through water, rocks, dirt, mud and anything else you can get into. That's what the women's Birkenstock Kalahari sandals are all about. Direct-injected polyurethane and TPU construction means durable longevity, supportive cushion and shock protection Legendary Birkenstock contoured footbeds deliver signature all-day support, plus added texture for grip when wet 3 hook-and-loop adjustable straps provide a custom fit and quick on/off Protective lip surrounding the entire foot adds protection from rocks and trail debris These are designed with an A-B width; that's the more narrow last from Birkenstock, but is equivalent to a regular width by industry standards