Like earlier Air Max models, the full-length air sole returns in the Nike Air Max 2003 - this time with a TPU mid-sole unit to support pounding heels. Most importantly, the Nike Air Max 2003 has a ventilated support strap on the inside to create the same fluid fit, feel, and appearance of a molded retro track spike. The clean, spare look of the Air Max 2003 is as impressive in town as it is on the track.