Whatever you choose, make sure that it is breatable and very light. At the same time, check to make sure that it is quiet. I have a white water outdoors outfit that I take on my bivy hunts. I also use the jacket every day as an outer shell to help cut down on weight. The coat makes an awesome windbreaker. To me it was well worth the money.

This company also sells the sherpa fleece that goes underneath, puts some poly pros under that and you are ready for whatever mother nature can dish out.

Just remember that poly and fleece will dry quickly if needed on a week long back country hunt. And your outer layer will keep the wind out and the heat in..