If your foot points down, you need to measure the distance between the top of your big toe and an imaginary line from the bottom of your heel.

如果你的脚底朝下，那么你需要测量你的脚后跟到你大脚趾所在垂线的最短距离。

youdao

If your foot points down, you need to measure the distance between the top of your big toe and an imaginary line from the bottom of your heel.

如果你的脚底朝下，那么你需要测量你的脚后跟到你大脚趾所在垂线的最短距离。

youdao