BoostTM Technology - Energy-returning properties keep every step charged with an endless supply of light, fast energy. Air Mesh Upper - Provides breathability, allowing air to penetrate the exterior for a cool internal environment. ADITUFFTM - For the best abrasion resistance in the toe area. Supportive Cage - Ensures stability and agility in midfoot is attained. TORSIONÂ® SYSTEM - Provides best midfoot integrity and motion guidance.