Western Mountaineering UltraLite 20 Degree Sleeping Bag Interlocking draft tubes and a full down collar that wraps snugly around your neck to help seal in heat Breathable, water resistant shell protects you (and the down) from condensation 5 1/4" spacing of continuous baffles that encircle the bag from zipper to zipper 16 oz of 850 fill is highly compressible, light weight and toasty warm 5" of loft, rated at 20? F