The Air Structure Triax 91 is like a combination of the Air Max 90, the Air Stab, and the Air Max 180. The Nike Air Triax running shoe is built from a high-tech carbon-based fiber manufactured by a Japanese company. The high tech material is not only waterproof, but it is also breathable which is a GREAT combination for runners. The Nike Air Triax 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 Nike Air Triaxis as impressive in town as it is on the track.