If our adventures don't stop when the days get shorter, the Lost Dog Sleeping Bag keeps us warm throughout the winter. Even though this bag isn't as light as its down counterparts, we have peace of mind knowing that if a snowdrift blows into our tent, the hydrophobic fibers coupled with the water-repellent finish keeps us warm even if we get wet. We Stay even warmer by zipping the Lost Dog to another Big Agnes sleeping bag for a snugglefest after the sufferfest.