The Marmot NanoWave 50 Degree Semi Rec Sleeping Bag features a semi rectangular cut with more room in the footbox for a comfortable night's sleep. This super packable, lightweight bag is a master space saver. DWR treated polyester taffeta fabric sheds moisture. EN tested to 50F, the bag has synthetic SpiraFil high loft insulation that stays warm even when wet. SpiraFil high loft insulation. 100% polyester taffeta DWR shell and lining. Blanket construction Snagless draft tube. Feely draw cords. Two way zipper sliders, zipper garage. Hang loops. Compression stuff sack included.