Bought these boots for my boyfriend for our trip to Iceland and also to use for deep winter. We haven't ventured out with them yet but just wanted to chime in on sizing. My boyfriend wears a size 11.5 - 12 shoe and I was worried about getting him a 13 in these boots but decided to do it because of the other reviews and the thick inner lining. SO glad I did. The 13 looks enormous on the outside but fits him perfectly inside. Very happy with the quality.