The Adidas Terrex Fast X FM Mid GTX are a super light hiking boot designed for fast outdoor activities. A Gore-Tex membrane keeps the wet out while allowing your feet to breathe so regulating temperature during high energy pursuits. Speed lacing construction for fast and snug lacing. Traxion featuring Continental rubber for extraordinary grip. Outdoor specific Formation unit for enhanced motion control and downhill comfort. Midsole forefoot adiPRENE+ for forefoot propulsion and efficiency.