With a new lightweight Stone Shield TPU plate that enhances foot impact protection the Women's Nike Air Trail Pegasus III is ready to hit the trail and fly. Durable textured synthetic overlays from heel-to-toe target trail stability and support while an original Nike Air Sole unit design offers classic time-proven versatility with air pillow shock absorption. An aggressive carbon rubber waffle outsole provides secure all-terrain traction. A Nike pocket under the sockliner provides a secure place for an Apple iPod™ nano sensor that enables you to transform your iPod nano into a personal workout coach with the Nike- iPod™ Sport Kit hookup (not included). This wireless sensor and receiver combination works exclusively with your Nike- shoes and iPod™ nano to give you real-time feedback during workouts and let you track your performance on your Mac or PC.