I know it can be tricky buying boots on-line, but I couldn't find these boots locally. I usually wear a 10.5, so I figured that I would be OK with an 11. Nope. With the 11's, my toes go to the tip of the boot (with thin socks) and I'm sure would eventually cramp up. With the Ion's, I guess that I'll need an 11.5. The boots otherwise seem great, but I obviously can't really review them. Just be aware that they definitely run small!