Altitude VI i WPLeather upper provides durability and comfort and protection from the elements I shield repels water and dirt and is resistant to stains Dri Tec waterproof, breathable membrane keeps feet dry Rustproof hardware lacing system for a secure fit Micro fleece moisture wicking lining for a soft and comfortable feel OrthoLite Impressions sock liner with slow recovery foam delivers superior cushioning Nylon fork shank for support and improved gait Impact