There are a number of different shoe-size systems used worldwide. But on the other hand it depends on the length of your individual foot.
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This means its important to measure both feet.

. While all shoe sizes use a number to indicate the length of the shoe they differ in exactly what they measure what unit of measurement they use and where the size 0 or 1 is positioned. This starts with knowing how to measure your shoe size. A shoe size is an indication of the fitting size of a shoe for a person. Many people have one foot thats slightly bigger than the other.
On the one hand shoe size depends on the shoes manufacturer.
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