1.freedom of movement. 2.tapered shape 3.wide at feet 4.ease of use 1,commodity name:envelope style sleeping bag2,Shell:190T polyester taffeta w/p 3,Lining:t/c4,Filling:250gsm polyester fiber5,Comfortable temperature:8°6,Extreme temperature:0° 7,Weight:1.20KG8,20'FCL 2400pcs