As a european let me tell you that different brands still have different sizes. While on some brands I have a 43 on others I will need 44,5 to feel comfortable. In most cases the same brand has the same sizes on different models, but even this may vary. More on reddit.com

Hey! I have created a website for this, stil clunky but it works :) It’s 100% free and you get the right size for your online purchase, let me know how it goes :) righsize.com More on reddit.com

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