adidas Response Boost Techfit Running Shoes Mesh Overlay - Provides your feet with great ventilation whilst your run. Synthetic Underlays - Work in conjunction with the shoes lacing system to provide for secure snug fit. Layered Tongue and Interior - Designed with sweat wicking properties that help guide sweat away from your feet whilst you perform. TORSION System -Provide for excellent stability in the midfoot. External Heel Counter - For a snug heel fit and comfort in motion with enhanced support and stability.