Nike's 2003 flagship shoe, the Air Zoom Breathe Free is packed with performance technology. The front of the Air Breathe features direct-inject Drag-On material over a mesh upper. The Drag-On and mesh upper combination is designed to produce a ventilated, flexible, durable and supportive upper. For cushioning, the Air Zoom Breathe Free features heel and forefoot Zoom Air units. A TPU midfoot shank increases torsional rigidity for better stability and places the flex point in the correct position.