DESC: The Classic Series semi-rectangular bags are versatile and comfortable. They offer plenty of room to move around yet they pack small and light, making them perfect for backpacking and car camping. All Classic Series bags are designed to be used with a 20’ wide rectangular pad. The Farwell is the warmest of the Big Agnes Classic Series, Synthetic fill bags. It utilizes A-Flex Construction, Polarguard Delta fill, and is rated to 0 Degrees .