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.
Stüssy is a clothing brand and a private company founded in 1980 by Shawn Stussy. The company is one of many that took advantage of the SurfWear trend coming from Orange County, California. Since 1992, the brand has been sold throughout the United States in special boutiques and department stores.