The inside leg length is measured as follows:
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Stand straight up on your bare feet (do not wear any shoes).
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Position the inside of your feet approximately 200 millimeters apart.
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Pull a tube with a diameter of appr. 35 millimeters (or the back of a book)
firmly to your crutch until you can feel it against the bone.
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Position yourself in de middle of the tube or book; measure the distance from
the feet to the top side of the tube both in front of you, as well as behind
you (see drawing), add those two sizes and divide the respective results by
two.
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Close this page and enter the inside leg length in millimeters on the measuring
form.