text: I wear a men's size 10 in most brands, sometimes 9.5, sometimes 10.5. Therefore I should fall perfectly into the Medium sizing, but my foot doesn't even fit without serious effort. Once I get it on, it squeezes my foot like crazy but is. loose around my leg. When you flex your foot towards your shin, there is a crease that forms on the outside that has caused me (and other reviewers) a lot of discomfort on the front on the ankle.