I've been wearing Xero Prios for 6 months now and was looking for something with more outsole protection. After an unsuccessful experiment with Merrell Trail Gloves, I took them. I like the thicker sole for daily dog walks and don't mind the slightly less ground feel. However, they suit shorter and narrower hair than the Prios. People with normal feet could probably go up a half size, but I have a Sasquatch 14 and 14.5 doesn't exist.