W59 On Running Women's Cloud 5 Designed to be the lightest fully cushioned running shoe, the Cloud is a true On icon. Since launching in 2014, it's topped Olympic podiums and walked Parisian catwalks, winning awards and fans all over the world. Stylishly concealing state of the art running technology, the Cloud is the perfect performance shoe for all day, every day wear. It's the best-selling On for a reason.