When warm summer temperatures seep into fall's chilly grasp, we grab our Marmot Micron 40 Degree Down Sleeping Bag for the perfect amount of warmth on those cool nights in the high country. Made with 650-fill down and a synthetic exterior, this mummy bag keeps us warm on brisk September nights in the wild with our friends and then packs down small for easy carrying and storage the next morning. With added Down Defender, this sleeping bag fends off light water and the occasional spilled beer so our summer camping trips never end early due to soggy gear.