Features of the Keen Women's Explore Vent Shoe Removable, Dual-Density PU Footbed With Arch Support For Long-Lasting Comfort EVA Midsole For Lightweight Cushioning KEEN. ALL-TERRAIN Rubber Outsole For Higher-Traction Grip 4mm Multi-Directional Lugs For Traction Stability Shank Delivers Lightweight Support KonnectFit Heel-Capture System For A Locked-In Feel Eco Anti-Odor For Freshness