The first running model of the Shox series, the Shox R4 was inspired by the springy indoor running track at Harvard University. Released in 2009, the Nike Shox R4 'Dark Charcoal' sneaker is equipped with a two-toned upper with perforated and paneled overlays. Hints of green add a pop of color to the exterior. Below sits four hollowed-out columns constructed of high-density PU foam for premium bounce and impact control.