A PU midsole works with Nike Air Max cushioning to ensure that every step is plush and comfy.Men's Nike Air Max Goaterra Boots. Sick styling, a smooth leather upper with metal eyelets and a rugged rubber traction sole equal a boot that can stand up to whatever Mother Nature has in store. What's better than an all-weather outdoor boot? How about one with Nike Air Max cushioning? That's what you get with the Nike Air Max Goaterra Boots. Up your boot game this season with the updated Nike Air Max Goatarra Boots.FEATURES:UPPER: Smooth leatherMIDSOLE: PU foam, Air Max unitOUTSOLE: Lugged rubber traction sole.