I typically wear a 7.5 women's shoe. When half sizes aren't available, I get an 8 and they run loose on my foot. These size 8 sloggers are tight. I cannot wear a sock and are so snug that they are difficult to get on without using my hands to get the heel part on. They run even smaller than my normal size 7.5 in my opinion and I have a slim med. Sized foot. I also was very disappointed by how hot these shoes get when wearing them. Really uncomfortable for the outdoor/gardening shoe I had purchased them for. I would return them, but already used them outside :(