I read and still don't understand how the wiggleys works to prevent icing on what ever out side layer you use.<br><br>The way I see it if the bag is open to cold air with no other cover the outter fabric with freeze up and seal up at that point. if a canvass outter cover is used then the icing will be on the canvass, and the same thing even with gortex. The icing occurs where the 2 radicaly different temps meet.<br><br>I just want to understand..... I am not saying it doen not work, but that I don't see how wiggleys do work.... Mac