Yeezy Foam RNNR Onyx EU 40.5 The adidas Yeezy Foam Runner Onyx applies a sleek monochrome finish to the futuristic slip-on. Black injected EVA foam is utilized on the molded one-piece upper, featuring sculpted lines and a series of strategically mapped vents that allow for increased airflow. A contoured heel provides a secure fit, while the soft top layer of the footbed delivers step-in comfort. The lightweight build is underpinned by a wavy-traction outsole that offers sure footing on wet or dry surfaces.