It’s easy to make things lightweight. The challenge is to make them as light as they can be without going too far. Siren takes away everything extra without taking away the promise of a warm and draft-free night’s sleep.
We added a new temperature rating to the 2015 Backpacker Editors’ Choice Award Winning Sonic series of sleeping bags. 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 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.