The Chaco Zong Sandal is part Z/2, part thong. The Zong allows for free-heel convenience while keeping your forefoot firmly engaged in the mission at hand. Wrap-around toe loop does not pull straight back between the toes With BioCentric" support, a new, softer footbed and Vibram outsoles that can be re-soled, the Z/rivative line is a thoughtful approach to slip-on sandals. Be sure to read the Z/rivative Sandal adjustment guide in order to properly fit your new