{"product_id":"bison-stormshield-40","title":"Bison StormShield -40","description":"\u003cp data-start=\"347\" data-end=\"660\"\u003eWhether you’re pushing beyond the Arctic Circle or climbing above 8,000 meters, the Bison StormShield is a \u003cstrong data-start=\"454\" data-end=\"505\"\u003eweather-resistant -40°F expedition sleeping bag\u003c\/strong\u003e built for the most extreme environments on Earth. When survival depends on your gear, this is the bag you want in your pack—or more accurately, your sled.\u003c\/p\u003e\n\u003cp data-start=\"662\" data-end=\"1105\"\u003eEvery feature of the Bison is engineered to maximize warmth and retain loft in brutally cold, wet, and windy conditions. The StormShield™ shell fabric is windproof, water-resistant, and highly breathable, protecting the insulation while allowing moisture to escape. Inside, a massive 42 ounces of 850+ fill power goose down is arranged in patented V-Block side baffles and horizontal cross-baffles, locking in an astonishing 10 inches of loft.\u003c\/p\u003e\n\u003cp data-start=\"1107\" data-end=\"1451\"\u003eDouble interlocking draft tubes run the length of the zipper, and an oversized, weather-sealed draft collar encircles the neck to seal in precious body heat. The down-filled hood features a differential cut and a form-fitting shape that insulates without compressing the loft, providing warmth and protection even in spindrift or howling winds.\u003c\/p\u003e\n\u003cp data-start=\"1453\" data-end=\"1705\"\u003eDespite its expedition-ready design, the Bison remains surprisingly packable for its warmth class. It’s the ultimate choice for polar explorers, winter mountaineers, and high-altitude expeditions where exposure can last for days and shelter is minimal.\u003c\/p\u003e\n\u003cp data-start=\"1707\" data-end=\"1969\"\u003eMade in the USA with meticulous attention to detail and the highest-quality materials, the Bison StormShield is the warmest sleeping bag Western Mountaineering offers. It’s more than a sleeping bag—it’s a life-support system for the coldest places on the planet.\u003c\/p\u003e","brand":"Western Mountaineering","offers":[{"title":"Magma \/ 6'0\" \/ LZ","offer_id":67831318216806,"sku":"60BISSTSLZ","price":1400.0,"currency_code":"USD","in_stock":true},{"title":"Magma \/ 6'0\" \/ RZ","offer_id":67831335420006,"sku":"60BISSTSRZ","price":1400.0,"currency_code":"USD","in_stock":false},{"title":"Magma \/ 6'6\" \/ LZ","offer_id":67831318249574,"sku":null,"price":1440.0,"currency_code":"USD","in_stock":false},{"title":"Magma \/ 6'6\" \/ RZ","offer_id":67831335452774,"sku":null,"price":1400.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0272\/4197\/1814\/files\/BISON-STS-Vert-Open.webp?v=1793047001","url":"https:\/\/mtnchalet.com\/products\/bison-stormshield-40","provider":"Mountain Chalet","version":"1.0","type":"link"}