I bought 11W. Usually I'm 11EE, sometimes 11.5 depending on the manufacturer. They fit well, not as wide as my regular EEs, but they can be a little longer if you're not wearing socks. I'm not planning on wearing them to a race event, I want something that's easy to put on and take off, so I left them on. Half a size smaller is probably preferable if you like it tight.
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