I personally wear a 9.5 US in the Barrie, 9UK in the Rain and Forest and an 8.5 UK in the Detroit. For reference my feet measure slightly more than 4 inches across in the forefoot, 11 inches in length, and I have a relatively high instep. I found the 9UK in the Detroit to be too long. Hope that helps.
9/20/14 at 1:14pm