Bison GWS Expedition

Bison GWS – Gore Infinium™ Extreme Expedition Sleeping Bag Denali to Aconcagua to the Himalaya, the Bison GWS is built for the most extreme mountaineering conditions on Earth—places where failure is not an option. Trusted by professional climbers and polar explorers, this bag delivers life-saving warmth and protection in the coldest, harshest environments imaginable. With 42 oz. of premium 850+ fill power ethically sourced goose down, the Bison GWS achieves an incredible 10 inches of loft and a -40°F (-40°C) temperature rating. The Gore Infinium™ shell provides outstanding water resistance, windproof protection, and breathability—essential for surviving high-altitude storms and Arctic gales—while remaining lightweight and highly compressible. Its V-Block Side Baffles and horizontal chest baffles keep insulation exactly where it’s needed, while double interlocking draft tubes and a fully down-filled Gore Infinium™ collar lock in precious body heat. The massive, fully insulated hood—crafted entirely from Gore Infinium™—features an integrated ruff that seals your face from the elements, even when the wind is screaming outside your tent. Despite its extreme capability, the Bison GWS weighs only 4 lbs 10 oz (2,097 g), making it one of the lightest true -40°F expedition sleeping bags available. For high-altitude mountaineering, polar crossings, and winter expeditions where absolute warmth and protection are non-negotiable, the Bison GWS is the ultimate choice.