i'm a little confused abt sizing, the page w the shoes says eur 42 is a size 9 but everywhere else says 11.5 is a eur 42, i've also gotten eur42 before

Markhor Shoe Size Guide

i'm a little confused abt sizing, the page w the shoes says eur 42 is a size 9 but everywhere else says 11.5 is a eur 42, i've also gotten eur42 before

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This formula worked for me in the past. Now it says I'm 9 years

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Markhor Shoe Size Guide