Heather V.wrote a review of Marmot Col MemBrain Sleeping Bag: -20 Degree Down on February 4, 2011
This bag is pricey but I have never regretted it for a second. I have used it on many winter trips and it keeps me very warm and dry. I love the waterproof shell it seems to work great and gives me that extra peace of mind. If it is not extreme winter weather I just sleep in this bag with a tarp over me. If it is heavier wind/snow/cold I bring the bivy. If you winter camp this bag is a great idea.