The ASICS GEL-CHALLENGER 15 tennis court shoe is one of the most comfortable stability shoes. The shoe's soft, yet supportive upper is also met with a thicker collar to help create a more comfortable wrap around your foot. 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. The full-length outsole and separated groove design helps create a larger contact area. This helps create softer landings for better overall comfort. Polyester upper. Polyester lining, insole. No-sew overlays Improve support and flexibility TRUSSTI. PROPEL cushioning Helps create powerful jumps and softer landings. Synthetic rubber outsole.