Originally Posted by
RB1-luvr
you might want to roll up a thin wind vest and put in your back pocket. When you get to the top of mountain, put it on while you ride. Mine is mesh on the back so it breaths on the way down, but stops the wind from making my core cold. It rolls up into a ball about the size of a apple or smaller perhaps and weighs next to nothing.
this. you want your body to breathe on the way up, and throw something light and wind resistant (on the front) on the way down.