Looks really good quality. I wear 7.5 women shoes and medium fits well. Not sure, though, that compression is a great thing in quarter socks. It feels great on the foot when running, but upper band cuts into my ankles bit too much (and I have thin ankles), so it becomes bothersome after a while. I wouldn't wear them whole day, or on a long plane travel, but as running socks they work for me. Next time I'll try "no show", it might be better for me.See full review