I bought about a dozen New Balance boots in sizes 11.5 and 12 and they were the tightest I've ever tried. I bought 11.5 but I don't think even 12 will be comfortable. The midsection and toe box in particular were very tight. I'm also not a fan of the non-removable insole (at least it seemed to be glued on). Pros: You look good. My dog liked it.