I have a size smaller pair of these as well. Those are perfect for bare feet but a bit tight with socks and I wanted to see how they'd perform with socks in a bit more roomy version. They fit and work well, except for one minor flaw. There seems to be a bit of a problem with the heel fit in the left shoe in both pairs. There's too much room at the bottom, near the sole with just enough amount of space higher up. There's no way to fill that space unless your left heel is terribly deformed. Not sure how that's happened since the right shoes are just fine. Technically, it doesn't bother me much and didn't cause any problems while running over a relatively long distance (8 miles), but it does look and feel a bit weird.