Design: Upper is made of durable Birko-Flor®, an easy-to-care-for and hygienic PVC material that is lined with soft, breathable fleece Two straps, each with an individually adjustable hook-and-loop closures for the perfect fit every time In-Shoe Comfort: Anatomically shaped PU footbed offers all-day support Durability & Traction: Lightweight PU/TPU outsole adds traction Additional Details: Synthetic PU material is water-repellent and dirt-resistant Birkenstock Women's Sahara Birko-Flor Sandals