Muck Boots SUV Hiker Shoe. This Hiking Shoe has natural rubber upper reinforcement for added durability. 5mm cr flex-foam bootie with four-way stretch nylon, 100% waterproof, lightweight and flexible. Reinforced toe and added toe protection with a wrap-up bumper. EVA molded midsole with contoured footbed. MS-1 molded outsole is rugged, aggressive and durable for maximum protection and stability.