It has taken quite a few miles to break these in, the back really dug into my ankles.  I don't need any special support, so these were fine in that department...They are very breathable!  I love the mesh - my feet don't get that gross "swamp" feeling in the summer, the con here, though, is if you're running outside or on trails, dirt is more likely to get in there.  The good outweighs the bad.