if its the same helmet he's been wearing for the past couple years, the one with the big fin at the back, it cant be an evo. Animal site says its Bell.
although, Dan Atherton was wearing a 661 lid too, so who knows. http://www.pinkbike.com/photo/1952424/
It is the new Evolution helmet from 661. I got some to them while they were in CA training for testing and feedback. They liked it so we signed all 3 of them for helmets. Ross Milan was also running an Evo helmet. Those are the only 4 on riders right now. They will be available for the public early next month. They meet ASTM 1952 standards as well as the standards that our old helmets met. The fiberglass shell helmet is lighter than any other full face that we have done and the carbon is even lighter than that.