Great for rocky shoreline excursions and summer trails Keen's Zerraport Sandal features a lightweight synthetic webbing upper matched with a rugged multi-directional carbon rubber outsole. It's an ideal balance of traction and breathable comfort that works great for walks and short hikes on challenging tropical terrain. The dual adjust webbing provides more support than conventional sandal strap uppers making the Zerraport an excellent pick for challenging terrain and high spaces where every step counts.