The GEL-CHALLENGER® 13 tennis shoe creates the stability you need when you're covering the baseline, so you can keep your mind focused on controlling the point. The shoe's supportive upper keeps your feet locked-in on the shoe's platform. It creates a reinforced feel during volleys or when you're dropping back to track down deep lob shots. WINGWALL™ technology is placed in the sidewall to improve stability during side-to-side movements. This feature offers good support, so you can step into your shot and stroke the ball with more pace.