Chris Purkeywrote a review of Bern Diablo Helmet - Kids' on July 19, 2016
Familiarity: I've put it through the wringer
I bought this for my 2 year old son, who has a massive 21" head. The dimensions on the helmet indicate it should fit him, but yet it's still a little too big. Luckily, he's not doing anything crazier than zipping around on a strider in the driveway. I would have preferred a more snug fit though.