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Buy one size smaller.
“I love how light and thin they are, but the fit was something I was hesitant about. I'm normally a US W8, and historically I've been a EUR39 so when the 8 was marked as a 40 I was already hesitant. I measured my foot and decided to size down to a 7.5 and genuinely wished I would have gone with a 7 since I wear them barefoot ☺️ other than being a little extra roomy they fit sooo well and I love how flattering they are. Highly recommend”