The Nike Shox Navina running shoe features a lighter, sleeker, performance-focused women's-specific Nike Shox™ platform for the young runner. Open breathable mesh upper with synthetic overlays provide support in the midfoot and heel while the radiused heel and Shox columsn offers a softer crash zone. A sculpted top and bottom plate with transition wedge keeps the weight down and provides a smoother transition. Women's-specific flex grooves, Pylon forefoot offer maximum flexibility while the BRS 1000 outsole provides durability and traction. This model is part of the Nike Plus line which can interact with your Ipod Nano. For more information and to purchase the accessory kit, visit the Nike Plus website.