Nike Women's Air Span+ 6The Air Span 6 has everything you look for in a running sneaker: stability, flexibility, and a cushioned ride. They have an open sandwich mesh upper with supportive overlays and soft linings, full-length Air-Sole unit to absorb impact, BRS 1000 heel for longevity, and a solid rubber Waffle outsole for superior traction. Nike obviously crossed the finish line with the Air Span 6, now you can do the same. This model is part of the Nike Plus line which can interact with your Ipod Nano.