The adidas Yeezy Foam Runner 'Onyx' applies a sleek monochrome finish to the futuristic slip-on. Black injected EVA foam is used in the one-piece molded upper, with sculpted lines and a series of strategically assigned vents that allow for increased airflow. A contoured heel provides a secure fit, while the soft top layer of the insole provides underfoot comfort. The lightweight construction is supported by a rippled traction outsole that offers sure-footed footing on wet or dry surfaces.