adidas Sport Performance Men's Kumacross Mid GTX Boots Nubuck / Synthetic traxion sole Upper: Strong nubuck leathers and synthetics for extra durability and stability. Lining: Gore-Tex extended comfort footwear - waterproof and breathable. Ideal for higher activity levels. Midsole: Thin TPU foil for enhanced stability in the midfoot area. Midsole: adiPRENE insert for comfort and shock absorption. Outsole: Traxion the perfect combination of stability and grip for hiking.