Stuff the super packable Marmot NanoWave Sleeping Bag (45° F) Down into your kayak stern or bike paniers – the lightweight bag is a master space-saver. DWR-treated polyester taffeta fabric sheds moisture. EN-tested to 45°F, the bag has synthetic SpiraFil high loft insulation that stays warm even when wet. The NanoWave packs down tightly with the included stuff sack and weighs in at only around 2 lbs. No matter where your adventure lies ahead this summer, count on the NanoWave to keep you dry and warm at a price that we can all afford.