I usually wear an 11 or 11.5 4E but based on other reviews I bought it in a 10.5 extra wide. I might be ok with 10 extra wides, but that's ok. It's very comfortable and I like BOA. I have a high arch and the standard insole doesn't have enough arch support so I replaced them with the FORM Premium Maximum Support insoles which work very well. The only thing I agree with is that with my high instep getting dressed is a chore. The gusset on the upper instep is difficult to pass even when the BOA is fully open. I have to use a long stainless steel shoehorn to put them on. Once in, I'm fine, but without a shoehorn, I doubt I'd even be able to wear them. Keep that in mind if you're having trouble putting on slippers like I do.
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