With a new lightweight Stone Shield TPU plate that enhances foot impact protection the Men'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 in 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.