Micropuff works extremely well for me. Being from AK and enjoying sheep hunting more than anything else, weight and moisture are my biggest concerns. I use it as an insulating layer under Sitka outer layers, it works great, and is synthetic. I carry a lighter sleeping bag as well and use it night to make up the difference. One of the best qualities is the pants are full zip, allowing me to shed and add the lower layer without taking my boots or pants off. Just drop my trousers and zip up. I am a skinny dude and get cold easy, wouldn�t leave home without them.