I've worn SAS shoes for decades for their comfort and size. I decided to buy this slip-on model because of a variety of styles and not to tie the laces. I'm a size 5 which fits me well with medium sized socks, but I find them a little loose in the heel area where my foot (especially the right) tends to slip. I think adding a heel brace around the ankle might help. Otherwise, I'm happy with the fit and comfort of this shoe. I am 81 years old and have had 5 pairs of SAS shoes in total and just changed a pair!