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Insulated sleeping bag liner adds extra warmth and personal hygiene to each sleeping bag Lightweight and insulating, Thermolite Pro technology with hollow core fibers and infrared absorbing pigments improves heat with minimal pack size and adds down to -13.9 degrees F Freedom of movement with stretch knit fabric and molded arm openings for unrestricted movement and natural comfort throughout sleep Technical shape and fitted hood provide optimal warmth and comfort without adding weight or bulk; fits into any sleeping bag thanks to stretch fabric Lightweight Long measures 78 x 31.5 inches and weighs 9 ounces; packs to 7.1 x 3.9 x 3.9 inches with a pack weight of 9.5 ounces