Big Agnes Zirkel SL 20 Degree Sleeping Bag 800 fill goose down to keep you warm and toasty down to 20 degree temperatures Integrated pad sleeve. Never roll off your pad again Built in pillow pocket holds a fleece or Big Agnes Pillow No-draft collar seals around neck to keep cold air from sneaking in Shell and Pad sleeve: Toray fabric. Ultralight, high thread-count, rip-stop nylon with Kudos FP super durable water repellency technology