The Bayfield has a poron insole. I am normally a 10D in the 1 and 5 last with the exception being a 9.5D in the rough collection. I had the CXL Bayfield in 10D for 2 years and the black calf in 10D for a year. They fit OK with thinner socks but at the end of the day if I walked long distances I looked forward to taking them off. When I had my MTO Bayfields done I told Deborah that and she said they didn't fit and purchased them back from me for what I paid for them. She told me she didn't want me to have any AE shoes or boots that didn't fit perfectly. We talked about my foot and how it fit different lasts and she felt because of the poron insole a 10.5D would fit me perfectly, she said the way my foot is shaped it would move the widest part of the boot forward enough to where the ball of my foot is. I had my doubts but she sent me 10.5D and 10E. Sure enough just like she said the 10.5 D black calf fit me perfectly. When talking to her about options she said I could have them made without the poron insoles so I went TTS in 10D. But someone else on here was told that he could not have them made without poron insoles and I think he went up a half size. Bucksfan on the other hand went up a width in his CXL so he could wear them with a bit heavier socks. In my case that caused heel slip.