Birko-Flor upper: Made of easy-to-care-for and hygienic PVC, which has been lined on the inside with a soft, breathable layer of fleece. This high-quality material is very gentle on the skin, and it's comfortable while also being very durable. Adjustable straps with buckles Original Birkenstock footbed with pronounced arch support, deep heel cup, and roomy toe box; footbed molds and shapes to your foot Flexible, lightweight EVA outsole for shock resistance and durability Excellent pre owned condition