I was scrolling through the Head 21/22 race boot pamphlet (https://issuu.com/levnelyze/docs/raptor_wcr_guideline_20-21_dina5_v3_web) and I noticed the "Technical Data" section included internal measurements that I haven't seen before. Some are self-explanatory like Malleolus Width and Toe Height, but I can't quite grasp how the Instep Width is being measured such that it comes out almost 2x the last width. I'm also not sure how heel height and heel width are being measured. Are these standard foot measurements in any way?