I have wide feet with normal size heels. Depending on the style I could wear a 9w, 10m, 10. It varies if I am in high heels, loafers, running shoes or boot. I like a little extra room regardless of the shoes. I got these rain boots in a size 10. I wore them 8 hours the first day. They are extremely comfortable like house slippers. I tried them with thick socks the next day and loved them even more. I plan on getting some more in brown and the grey. I will update within the next 60-90 days to let you know how they are holding up.