On recommends buying your usual size as this model fits true to size As runners, On knows getting out there can be hard. So they made the Cloudrunner soft, yet also supportive. With instant comfort so awesome that just stepping in makes you want to head out. And a light, cushioned ride that encourages you to keep running. In fact, every element is Swiss-engineered to remove discomfort as a reason not to run. With the Cloudrunner, there's no stopping you. Engineered mesh upper offers supportive comfort with unbeatable breathability Wider bottom unit and a cradle-shaped construction for extra support CloudTec® cushioning in ultralight Zero-Gravity foam