Sphere Down Winter 4 Season Sleeping Bag

About the Mammut Sphere Down Winter

The Sphere Down Winter sleeping bag from Mammut is designed for budding alpinists and extreme cold adventurers who not only prioritise maximum warmth but also value minimal weight. With a ProlightTX exterior to provide wind and water resistance coupled with premium 800 fill 90% white goose down, the bag is not only light as a feather but provides exceptional insulation to remain comfortable in -10°C environments.

Insulation is provided by 750g of high loft 800 fill down with a 9:1 down to feather ratio. The fill is certified by the Responsible Down Standard that promotes strong animal welfare practices in all down sourcing.

A two-layer, 9 chamber construction allows for high lofting of the down in core areas of the body. This provides enhanced comfort at lower temperatures. With a wave contoured internal chambers, the construction of the Sphere down restricts the down’s movement thus preventing cold spots.

An updated zip prevents snagging and is fixed on a diagonal line from the collar allowing for anatomically natural operation with a dominant hand. ProlightTX provides a water-resistant exterior improving the longevity of the product and optimising down performance in damper conditions. The interior fabric, lightTX, provides optimum comfort for nights under canvas. Both fabrics are Bluesign approved to highlight the sustainable construction process of the Sphere sleeping bag.

With a fantastic warmth-to-weight ratio, the Sphere Down Winter Sleeping bag is geared towards the avid cold weather adventurer looking to push their boundaries on long-distance trails like the Idotorad or high alpine climbs. An exceptionally warm and compact goose down sleeping bag.