I got sized by KAV before they had their app. You do the sizing, (now via app) they print a head form (a replica of the inside portion) send it to you and you add/remove spacers as needed, while wearing whatever you normally wear under your helmet. For me that’s a Halo headband or cycling cap. you tell them what spacers you put where, then you wait and wait and wait and wait for your helmet to be printed and sent to you.
Even my first one took a long time, but that was due to an issue with the printing polymer. When the company making the polymer scaled up, for bigger quantities, the properties changed and set all orders back like 2-3 months.
So yeah, great helmet, but not the sort of thing you order if you need it in say less than 4 months. It’s kind of in the same window as a custom frame. Some back and forth, then you get in a que and wait.