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.
You don't have to worry about the pronunciation of the brand Han Kjøbenhavn. The important thing is that this brand, founded in 2008, is one of the absolute top Scandinavian fashion brands nowadays. It received wider recognition thanks to a collaboration with Puma. The Han Kjøbenhavn stores can be found in Copenhagen (of course), as well as in New York or Paris. If you're in no mood for a trip though, you can buy the brand at Footshop!