The outstanding cushion from the Nike Air Max Skyline shoes is further displayed through the large Nike Air bubbles under the heel of the sneaker. The PU midsole with visible Air-Sole unit at the heel for the ultimate in comfort as well as the rubber outsole with Waffle pattern for traction and durability. So they are the popular hit last year with its retro straight-outta-the-90's styling. Runners have put it, a various feeling, nevertheless, the key technology. It did not well know by public until a couple years following the release.