Dip the brush into a clean bowl of water and add a few drops of cleaner to the brush. Lather the entire shoe with the shoe brush until the solution becomes foamy. Wipe away the excess solution with a clean towel. Repeat until the shoe is clean.

Zoom Air is like a little air-filled plastic pillow they insert in the midsole. It's very similar to the Nike Air units they've been using for decades, but the "Zoom Air" unit has little microfibers inside the pillow that apparently help create a springier feel. Zoomx is a kind of foam used in the midsole itself.