Features of the KEEN Women's Uneek Astoria Sandal Non-marking rubber Outsole leaves no trace Recycled Pet plastic bungee cord and lace-lock system Stability shank delivers lightweight support EVA strobel for added cushioning Recycled Pet plastic Eco Anti-Odor for natural odor control Recycled Pet plastic cord Upper forms to the foot Aquagrip rubber with Aqua Stop zonal siping provides maximum traction on wet surfaces EVA Midsole for lightweight cushioning Quick-dry lining for active use EVA insole with arch support for all-day comfort