Here’s a screenshot of the sole from Inov-8’s site. These shoes are a 4 (out of 5) on their fit scale. I’ve found their 4 fit is great for my wide toes, but their 3 fit is too tight. The current model of Inov-8s I’m using (Terraclaw 250) have been discontinued, so I’m hoping these are a good replacement. They have a similar look, just a bit heavier.