The Marmot sawtooth is penultimate all-arounder 15f down sleeping bag. the Sawtooth blends just the right down warmth with just the right weight and a healthy measure of durability for an industry-leading bag.This Bag will keep you warm with Nautilus Hood that wraps around your head and reduces heat loss and Ground Level Seams: top layer wraps around the body creating a warm layer of down. Marmot sawtooth also has Down Filled Oversized Draft Tube that eliminates cold spots. The bag also features Zipper guard that stops the snags while zipping up the bag.