Place a piece of paper with the short edge against the wall & stand bare foot with your heel touching the wall marking the longest part of your foot, in millimeters measure both feet to be sure using this tool.
McKinlay's Shoe Size Finder
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Debug Dimensions
Body height:
Measure height:
PX to MM ratio:
Touch status:
None
Scroll delta (X, Y):
Position (X, Y):
0,0
Options
Scale
Choosing a selection results in a full page refresh.