adidas Outdoor Terrex Fast X Hiking Shoe - Men's Seaweed/Dark Cinder/Black 10 FORMOTION adapts to the ground to ensure the smoothest most comfortable run possible Synthetic mesh upper for comfort and light weight; Synthetic lining for comfort; Speed lacing construction for fast and snug lacing adiPRENE+ in the forefoot maintains propulsion and efficiency Push-through protection plate protects the foot against roots and rocks adiPRENE under the heel for superior cushioning at impact