Book size is the same, but it varies by how they fit.. there isnt a SET size, where a manufacturer has a limit before they have to deem it a different size, so one 10 is different form another 10, but its usualy close enough its a safe bet to buy your regular size. For me, my swat/cacoran boots are a 10, but my Oakley Tac boots are a 9.5 , feels the same though no matter what i wear
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