Slumberjack Big Timber -20 Degree Rectangular Sleeping Bag, Brown, Long - Right Zipper Fits to 6' - Weight 11lb 12oz Shell fabric 10oz cotton duck - Liner cotton flannel Two-layer, off-set construction and differential cut prevents cold spots Draft tube along zipper keeps out cold air and prevents heat loss along the zipper Zip Together feature allows two samesize rectangular bags to be zipped together for a double-wide