Women's Classic Synthetic bags offer all the modern comforts of a semi-rectangular design and the versatility and durability that recycled synthetic fibers offer. These Big Agnes System bags feature Insotect Hotstream® insulation and thermally efficient A-Flex™ or A-Shingo™ construction which distributes your body heat evenly through the bag. Our full pad sleeve design will work with any rectangular 20" wide pad. Stash pocket on the upper chest is perfect for lip balm, music players or ear plugs. A great value for super comfortable, well designed bags.