adidas Outdoor Terrex Fast X GTX Hiking Shoe - Men's Sharp Blue/Black/High Energy - 8.5 Lining: GORE-TEX Performance Comfort membrane. Waterproof and breathable. Midsole: Outdoor specific FORMOTION unit for enhanced motion control and downhill comfort. Midsole Full forefoot adiPRENE+ for forefoot propulsion and efficiency Outsole: Provides the best grip and agility during fast activities.