Leather upper. Waterproof, breathable membrane. Heat-resistant rubber outsole. KEEN.FUSION construction fuses the upper to the sole for a longer-lasting bond without glues or solvents. Contoured heel lock is anatomically shaped to reduce heel slip. Shank for midfoot support. PFAS-free, durable water repellent repels water. Leather Thickness - 1.60-1.80mm.