How to Measure Correctly?
To determine the right size, use a tape measure or meter ruler to measure the length of both feet barefoot and in a relaxed position by standing with your heels against a straight wall and measuring the distance from the wall to your longest toe. For this we recommend that you stand on a piece of DIN-A4 paper and draw your foot with a pen. It is easier and more precise if you have a second person help you. Make sure your heels are lightly touching the wall. For sizing, use the result of the longer foot as a guide.
Foot Length: In an upright, relaxed position, measure the length of both feet from the heel to the end of your longest toe.