{"product_id":"bristlecone-mf-left-zip","title":"Bristlecone MF Left Zip","description":"\u003cp\u003eThe Bristlecone MF is an expedition sleeping bag for extreme cold, designed for deep-winter comfort in the harshest environments. This bag is built for Arctic expeditions, high-altitude base camps, and late-season hunts where staying warm is mission-critical.\u003c\/p\u003e\n\u003cp\u003eIts wide, semi-rectangular shape provides extra space to layer up, shift positions, or simply stretch out. You won’t sacrifice insulation for comfort. With 850+ fill power goose down and massive loft, the Bristlecone offers serious heat retention in sub-zero conditions.\u003c\/p\u003e\n\u003cp\u003eThe MicroLite XP™ shell resists water and wind while remaining breathable. It sheds frost and spindrift while protecting the insulation inside. A full down-filled collar and insulated draft tube seal in warmth and block out the cold.\u003c\/p\u003e\n\u003cp\u003eThis bag thrives in bitter cold. Whether you’re camped in a snow cave or on a wind-swept ridgeline, the Bristlecone MF offers trusted warmth and durability. Its roomy cut makes it perfect for long base camp stays or anytime you want to sleep in full layers.\u003c\/p\u003e\n\u003cp\u003eAt 4 lb 3 oz, it’s surprisingly light for a bag with this much insulation and space. It packs efficiently for its size, making it ideal for cold, gear-heavy expeditions.\u003c\/p\u003e\n\u003cp\u003eHandmade in the USA, the Bristlecone MF combines expedition-ready performance with unmatched sleeping comfort. When the temperature drops and the weather turns unforgiving, this is the bag you’ll want to be in.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFEATURES:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFilled with 850+ Fill Power ethically-sourced premium goose down\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eSide block baffle construction for better control of insulation in colder weather\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eFull-length #5 YKK zipper provides a smooth, easy unzipping experience while saving weight\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eInsulated Draft Tube and Full Collar keep the cold air out and warm air inside to prevent heat loss\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eDurable 20 denier MicroLite XP™ outer shell stays more breathable and water resistant longer than traditional polyesters\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eDual zipper design allows sleeping bag to open completely for greater temperature regulation\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eComes with ultralight stuff sack and breathable storage bag\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e3 lb 15 oz. Total Weight\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Western Mountaineering","offers":[{"title":"6'0\" MF LZ","offer_id":53408450707738,"sku":"8455","price":1200.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0219\/8156\/files\/Bristlecone-MF-e1592347834796.webp?v=1794261902","url":"https:\/\/shop.alpineinstitute.com\/products\/bristlecone-mf-left-zip","provider":"The Equipment Shop at American Alpine Institute","version":"1.0","type":"link"}