I wear regular D-width Asics and they are a little narrower in the forefoot than I'm used to and were too tight to be comfortable. I wear 10 for Nike and many other brands and 10 or 10.5 for Asics, depending on the model. It was 10.5 and the length was just right, but unfortunately a little tight. They're also gel-free, so cushioning is good, but they're more durable thanks to the latest foam technology. I don't think they are suitable for hiking if you run all day or for long-distance runners.