Don't even try to measure your insole, you'll never get it right. Just look at the measurements on any of your sneakers in CM or CHN. Then take that information and find the corresponding US size in the size guide. For example, the insole length of 25 CM corresponds to US 7 in Vans. You may get a different US size with a different brand due to slightly different measuring.
The year 1979, St. Louis, USA. There and then the history of KangaROOS has taken off. The brand was founded by Bob Gamm, a former architect, that loved to run in his free time. Every time he went for a run, he was worried that he has nowhere to hide his keys and a few dollars, apart from his pocket, which was highly impractical. The idea turned heads, and currently, the brand operates in over 50 countries around the world. The brand stayed true to the original idea, so you can find a little pocket in each model until today.