The Shox R4 "Black/Silver" has been an innovative sneaker design since 2000. The Shox R4 became its time when it was first released, when it is considered by the rest of the runners of the time by placing four visible PU foam columns on the midsole. The inventive feature allows for controlled impact on the ground, while each column collapses quickly and slowly returns to shape. Two TPU panels help to dampen shock as every energy redirects to every step. Black synthetic leather that sits around the ankle collar and metallic silver trim of the trainer.