Just 'cause it's a recovery day doesn't mean you can't flex. This Rejuven8 Run comes with two removable booties for styling options. And those booties have their own thin rubber bottom so they can be worn without the upper. But if you do step into the upper, expect big comfort with its cushy foam and encapsulated Air. Benefits - Sticky rubber outsole adds grip even on slick surfaces. Extra room at the forefoot helps accommodate various foot widths. Ventilation holes help allow for breathability. Nike Air technology absorbs impact for cushioning with every step.