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1. Place foot on white paper and mark the longest points at the front and back as correct foot length.

2. If there is a slight difference in size between feet, use the data from the larger foot.

3. For high instep or wide feet, choose a size larger. For flat or slim feet, choose normal size.

4. The measured size should be approximately the same as usual. Significant deviations indicate incorrect measurement method or imprecise data.