The Silverthorne uses a 2-layer construction to help eliminate cold spots and keep you warm. There is also a zipper baffle to help seal in your body heat. It is composed of a 100% cotton flannel liner and rugged cotton canvas outer. When it's time to store or transport the bag, it conveniently rolls up with the roll-up straps so it's easy to carry and doesn't take up too much room. Two Silverthorne bags can be zipped together to create a double bag.
• Two-layer construction
• PolyLoft insulation
• 100% cotton flannel liner
• Rugged cotton canvas outer
• Roll-up straps and standard stuff sack
• #8 separating zippers
• Zipper baffle
• 5-Year Limited Warranty