Birkenstock Kalahari Black Open-Toe Strappy Active Outdoor Utility Sandals Womens Size 6/37 Great Pre-Owned Condition from theoutdoor/adventure collection. Three adjustable hook-and-loop (Velcro) straps: Two across the upper foot and one securing the heel/ankle. Sporty hardware: Features distinct plastic pull-tabs and loop anchors embossed with the Birkenstock logo. Adventure footbed: Swaps out the traditional cork-and-suede footbed for a water-friendly, polyurethane (PU) direct-attach footbed designed for extra traction and off-road use. Perfect for everything from light hiking and travel adventures to everyday street style