A unique shoe-to-sandal design from Keen allows you to wear the enclosed back like a shoe or to wear the back under your heel like a sandal. The convertible back strap can be worn at the ankle or over your instep. Leather webbing upper and mesh lining for maximum ventilation. Non-marking rubber outsole and removable metatomical footbed. Available in men's full and half sizes. Runs a half size small. Most customers order up half a size.