The Western Mountaineering Bison Gore Windstopper Sleeping Bag is a -40°F sleeping bag for mountaineering expeditions to the peaks you've always dreamed of. As the wind howls through the night and the snow is doing its thing up on the mountain, you can zip yourself inside this Bison for warm. Packed with 42oz of 850+ fill power goose down to create a 10' loft so you'll be sleeping soundly, dreaming of standing on the peak by sunrise. The GORE® WINDSTOPPER™ shell fabric provides the weather resistance you'll need in extreme weather and temperatures. Who would've thought all this warmth can weigh in at just 4lbs, 10oz? Made right in the good old US of A to make all of your cold weather dreams possible. Read More dojo.addOnLoad(function() {if(typeof(shoppingListJSPDP) == 'undefined' || shoppingListJSPDP == null || !shoppingListJSPDP) { shoppingListJSPDP = new ShoppingListJS({storeId: '10208',catalogId: '10000001',langId: '-1'}, {id: '201219', name: 'Western Mountaineering Bison Gore Windstopper Sleeping Bag', image: '//s7d1.scene7.com/is/image/MoosejawMB/10044148x1013039_zm?$product1000$', type: 'ProductBean', components: {}, skus: [{id: '270351', attributes: {'COLOR': 'Red','ESTIMATED_SHIP_DAYS': '5','SIZE': '6 FT / Left Zip','Color': 'BLACK'}},{id: '270352', attributes: {'COLOR': 'Red','SIZE': '6 FT 6 IN / Left Zip','ESTIMATED_SHIP_DAYS': '5','Color': 'BLACK'}},{id: '270353', attributes: {'COLOR': 'Red','ESTIMATED_SHIP_DAYS': '0','SIZE': '6 FT / Right Zip','Color': 'BLACK'}},{id: '270354', attributes: {'COLOR': 'Red','SIZE': '6 FT 6 IN / Right Zip','ESTIMATED_SHIP_DAYS': '5','Color': 'BLACK'}},{id: '6129089', att