I couldn't decide if I should get down or polyester sleeping bag. I wanted to have a very warm bag but at the same time I was afraid that down will get wet quite fast. Finally I found dridown, best solution that has advantage of both down and polyester. I test it few time but not in very extreme temperatures (not yet) so far so good. I bought one for my wife and then one for myself. I still recommend it to others.
This review was written in the old system and had content requirements that are different than reviews written today.