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It depends on what type of boot you use and the width of the sole. The only reliable way to insure a good fit is to try on the fins with the boots that you are going to use. Anything else would be a guess.Hi, I am looking to buy the Mares Avanti Quattro. My boot size is 9 so should I go for Small(size 6-9) or Medium(size 9-11) ?