I've never had the opportunity to check the misery index but I have an REI Travel Sack Sleeping Bag in my truck with the idea of using it as a base to prevent too much air movement, then layer over that with the wool and fleece blankets as needed. Nice thing about the REI Travel Sack is that there is no loft to compress so it stays rolled up in its bag and thus packs small. Hopefully I will not need to test this concept in arctic conditions. Being in SOCAL this is a safe bet. Until this winter I would have said that about Atlanta too