As an outer layer cold weather sit and glass jacket?Mountain Hardwear Ghost Whisperer. 10.7 oz. Hands down best packable puffy I have ever owned, and I have a bunch. They recently came out with a UL version which is 6.7 oz. Very tempting.
Which ambient ? And what layer are you using it for? I have the original ambient and I do not find it warm enough for static glassing sessions in temps in the high 20s.Another vote for the Ambient