NWOT Women's Wide Minimalist Barefoot Shoes - Zero Drop Sole Product details Sole material Rubber Outer material Mesh Closure type Lace-Up About this item Open engineered knit upper offers enhanced breathability and comfort. Zero-drop, non-elevated sole for proper posture and balance. Removable sockliner (insole) if you want a "more barefoot" feeling. Designed with a wider than average toe box to allow the forefoot to spread. The rubber outsole provides long-lasting durability and adequate grip.