Sonic 0 Sleeping Bag (850 Down)

The Sonic series of sleeping bags are built to put a smile on your face when the cold weather is keeping most people out of the mountains. We've used all the best ingredients of high end fabrics and 850 fill power goose down insulation paired with stretch construction at the knees for side sleeping. Thermo Gills regulate the internal temperature of the bag by as much as 20 F without letting drafts in.