I wear a women's size 7.5-8, medium width, but I have a very high instep and arch. So, I bought these in a W8 and they fit great, not too long, not too short, not too narrow or tight on the top of my instep and they have lots of wiggle room in the toes.  These have really high arch support, which works great for my bad foot pain (due to tarsal tunnel syndrome and plantar fasciitis). They keep my pain to a minimum and are my favorite shoes to wear when I need to be on my feet a lot. I can walk around in them for hours and I prefer these clogs over my running shoes (even with orthotic insoles). They are very springy, like walking on air and they have a decent grip on wet surfaces. I can wear these with thin or medium weight socks and they still fit and are warm enough to wear out in winter, at least in southern US temperatures. They can be warn without socks too but they make my feet sweat after a while. I love these shoes and highly recommend them for any type of foot, but I especially recommend them for people with foot problems similar to mine, and my podiatrist highly approves of them. During the summer I wear Oofos flip flops, which have the same arch support as these clogs.