Mammut Sphere Down Winter Sleeping Bag 5 Degree Down

To put it bluntly, staying warm while embarking on winter ascents in the high alpine is crucial, and the Mammut 5 Degree Down Sphere Down Winter Sleeping Bag helps you do just that. Designed specifically for cold winter backpacking or mountaineering, the Sphere features a bluesign approved ProlightTX material that's equal parts durable, highly compressible, breathable, and wind resistant. This fabric construction not only ensures maximum temperature regulation, but also assures that the elements won't sap your precious warmth. A DWR treatment fends off light moisture, while the 800 fill goose down provides warmth in the face of cold temperatures as low as 5 degrees Fahrenheit. Additionally, the wave shaped chambers prevent cold spots and bolsters the bag's heat retention, and the two layer foot area helps maximize warmth.