that's the funny thing, the visor is not sealed, but there's all types of padding in the helmet. I could do a handstand in it if i wanted to without it coming off. I did use waterfall conduit for the side vents though and i'm thinking that if i alternate inside/outside cuts i'll be able to keep the corrugated look but it will exchange air better.
The balaclava idea is awesome too!
thanks everyone for helping me out with this.