The Therm-A-Rest Stuff Sack Pillow is an ultralight sack for stuffing away your sleeping bag. But this stuff sack has a dual purpose. Simply reverse this Therm-A-Rest stuff sack, stuff in a jacket or some extra clothes, and you can use it as a comfortable trail pillow. The interior is a brushed polyester lining that feels great against the head, while the reverse 20D silicone-treated Cordura nylon is durable enough to stand up to the trail. So next time you have a hard day on the trail, you can sleep easy with the Therm-A-Rest Stuff Sack Pillow.