The Kalahari boasts a high level of comfort and great functionality. A back strap sandal with hook-and-loop fasteners and a PU/TPU outsole added for increased traction and durability. Designed for Birkenstock fans who are active and looking for some extra grip to their sandals. The Cross Element Adventure version goes a step further by making the style water-ready, so whether you're trekking over rocks or through rivers, your feet will always be comfortable and supported.