They're great boots. To me they fit a bit small. While most boots (RedWing GTs, IRs, Yuketen Maine Guide) I have are 10, I got these in 11 and they fit very well. I was thinking of getting 10.5 but was happy that I didn't. I haven't worn Aldens yet, but think I'll be a 10. So from that 12.5 would be the size for you.