I have size US 13, narrow, low volume feet. It's been an adventure just finding shoes that fit. I run on and off road and the fireblades are the perfect shoe for me. Features like the gaiter over the tongue and a airy toebox and snug heel work great on and off the road. I used to run in Brooks cascadias, but find the fireblades a much bettter match for me in terms of last and support. They are a stiffer shoe than the cascadias, with less cushioning, but feel more stable on any terrain.