Under Armour Men's HAW'MADILLO Hiking Boot 100% Ethylene Vinyl Acetate Imported Synthetic sole Shaft measures approximately 15" from arch Heel measures approximately 1.5" Platform measures approximately 0.5 inches Boot opening measures approximately 18.5" around Waterproof, full clad rubber upper is light & extremely durable Moisture-wicking interior lining for greater comfort when your hours out Reinforced rubber overlays for added protection where you need it Molded EVA midsole provides lightweight cushioning & shock absorption Molded Ortholite sockliner is designed with a memory foam top & PU base