Steve...I'm going to try UA too...I never have...if you haven't....buy the base layer Cabelas Down Filled Under wear....its awesome...I think UA + this and a light jacket could be the key...

seriously...I use this...its really light..and effective..realitively quiet...and HOT.

http://www.cabelas.com/cabelas/en/templates/links/link.jsp;jsessionid=NUNQBIX12RH5FLAQBBISCN3MCAEFEI WE?id=0005054920153a&type=product&cmCat=fr oogle&cm_ven=data_feed&cm_cat=froogle& cm_pla=0080902&cm_ite=0005054920153a&_requ estid=72520