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. Style #: 1041A222.102 UPC #: 196074098644 Tech & Materials PGuard™ Toe Protector Enhanced toe durability. Ortholite® Sockliner Moisture management (Ortholite is a registered trademark of O2 Partners LLC). WINGWALL™ technology Improves stability. AHAR® Plus Outsole Strategically positioned in critical areas of the outsole, this exceptionally durable compound is 50% more durable than standard ASICS High Abrasion Rubber. Rearfoot and Forefoot GEL® Technology Cushioning System Attenuates shock during impact and toe-off phases, and allows movement in multiple planes as the foot transitions through the gait cycle.