Have been reading http://board.gt-rider.com/topic.asp?TOP ... rms=jacket plus about Rocket / Gerricke jackets. Even found one formula to calculate wind chill factor equivalent temp. = s - (s - t)×(0.474266 + b×sqrt(v) + c×v)  Thought I would never ever freeze in Thailand, my trip taught me otherwise. Even during the day when temp was about 30, I felt cold. I wasnt wearing Joe Rocket Phoenix jacke /Heinz Gerrick air flow jackets. But I was wearing a windstopper undershirt for cyclists (traitor, shame on me) a windstopper jacket for cyclists (traitor, shame on me) a cotton jacket ....dont laugh, I was freezing. I understand that above jackets permits air to flow freely. What about wind chill ?? ( Dont think I need the protective funktions because of my side car the risk of a fall is much reduced) I like it light and easy. Suggestions ??