Seasonautumn winter spring whats in the box2 sleeping bag materialsspinning cotton polyester taffeta oxford flannel categorysleeping bag activityindoor outdoor traveling camping hiking beach fishing hunting size18m 20m functionflannel lined waterproof ultra lightul rectangular static free breathability moistureproofmoisture permeability keep warm foldable windproof sun protection anti insect anti mosquito dust proof wicking portable length cm210 notedouble sleeping bag