This is a really smart product! Embedded in the knitwear this cap contains D3O material. It is flexible as long as you move in a ‘normal’ way, but locks together on shock. We have been using caps like this since a few months, both for snowboarding and cycling through London. They are much more comfortable than the traditional helmets, and also much better looking! The caps are made by Ribcap. I had some trouble finding a store that sells them. In the end I succeeded in Amsterdam at
Skatezone.