NEMO designed the Moonwalk 30 for the backcountry hiker/hunter in mind. They gave this bag not only waterproof Down using DownTek but also a completely waterproof tub design! That means this bag can be used directly on the ground! If you're looking for the ultimate bivy package then be sure to check this lightweight bag out to add to your system!Features:650 Fill Power Downtek DownTemperature Rating: 30F / -1CDrawstring Collar seals in body heatPadded sleeve load from above maintaining waterproofnees of the tub designWaterproof / Breathable FootboxPerfect for Backpacking or Backcountry HuntsInsotect FlowGates prevent downward movement of insulationVideo -NEMO Sleeping Bags Design