Rubber Sole 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. TORSIONÂ® System - Provide excellent stability in the midfoot. External Heel Counter - For a snug heel fit and comfort in motion, with enhanced support and stability.