Built for speed, endurance, and flexibility on the court, these tennis shoes take your game to the next level - now with a higher collar and tighter heel lockdown for stability.Features:FuelCell foam delivers a propulsive feel to help drive you forward.NDure upper technology designed for superior durability.Added lockdown and stability through heel and saddle.NDurance rubber outsole technology provides superior durability in high-wear areas to help get more out of the shoes.Non-marking outsole.Design inspired by racing cars.