I only have one other pair of boots (Justin's) that are 10D so that's what I ordered for these. The boots themselves are great, none of the manufacturing issues my (twice as expensive) Justin's have and are very comfortable. They fit slightly longer than I prefer, which is okay as no boot will fit exactly the same but I docked one star because the left boot is 95% perfect, while the right is very tight squeeze and pretty uncomfortable....the top of the boot is very tight and squeezes down a lot on the top of my foot. Width and length are fine on both, and the left boot is overall awesome, but the right one is very shallow height. Hopefully it'll break in and be nicer. My Justin's didn't need hardly anything to break in, but these Ariats feel like they'll take awhile. Keeping my hopes up though, and I'm sure they'll be fine.UPDATE:After about a week of wearing them 4-5 hours a day, they've broken in nicely! Any issues I had with them being to tight in any areas is gone. Originally posted 4 stars, but edited and gave them 5. After breaking in, these boots are amazing. Absolutely love them! Even have pretty good grip in snow