The Air Jordan 2 Retro SP x Union 'Grey Fog' features a grey canvas upper with matching perforated suede overlays and mudguards. Light blue eyelets, eyestay patches, and piping add a pop of color. Matching tongues with a yellowed woven tag and exposed foam edges offer a worn-in look to this futuristic design. From there, "UN|LA" and "HO2021" external tags provide a custom feel.