Oh, and re the beanie issue (And hoping it doesn’t derail the thread in to ANOTHER helmet debate…! 🙂 )
Yes, wearing a beanie under a helmet is fine. I often do it in really cold conditions (Thin Oakley beanie under a Smith lid). The key here, though is the fit of the helmet. A lot of those competing in the slopestyle had goggles under helmet, with a beanie, and what looked like a badly fitted helmet. Viz the way that both goggles and helmet were pushed back on the head after a run. The helmet should fit a lot more securely than many of them were running theirs, and that’s the problem. Not the beanie. (I suspect that it’s a little bit of a ‘too kool for skool’ mentality in there, sadly, a bit like MTB DH racers opting for gnar-pyjamas rather than something more aero that would save precious time in a run!)