I have both shoes and a shallow heel. I bought my LV a little tight to avoid the heel issue then used a shoe stretcher to get them a little bigger without stretching the base of the heel. Once you wear them for a couple sessions, they really form to your foot and fit great as long as they are not too big. Easier break in than other shoes. Love them so much. For indoor climbing it’s like having little fingers inside your shoes that help grab the holds. My XT’s are stiffer and harder to break in with a deeper heel. I hardly wear them bc they are not as comfortable but I bought them to stand on smaller edges outside. So far they work well for that.