Western Mountaineering Bristlecone MF

Bristlecone MF – Extreme Warmth Meets Expedition Comfort

When bitter cold and unforgiving conditions are part of the adventure, the Bristlecone MF delivers spacious comfort and serious warmth. Designed with a wide semi-rectangular cut, this bag provides extra room to layer up, shift positions, or simply stretch out—without compromising insulation. Packed with 850+ fill power goose down, it offers exceptional loft and heat retention, while the MicroLite XP™ shell delivers reliable durability and water resistance for extended time in harsh environments. A full down-filled collar and draft tube ensure that warmth stays locked in when temperatures plummet.

Built for Arctic expeditions, high-altitude base camps, late-season hunts, and deep-winter adventures, the Bristlecone MF is for those who demand reliable warmth, extra space, and the confidence to sleep soundly when the mercury drops.

• Filled with 850+ Fill Power ethically-sourced premium goose down
• Side block baffle construction for better control of insulation in colder weather
• Full-length #5 YKK zipper provides a smooth, easy unzipping experience while saving weight
• Insulated Draft Tube and Full Collar keep the cold air out and warm air inside to prevent heat loss
  
• Durable 20 denier MicroLite XP™ outer shell stays more breathable and water resistant longer than traditional polyesters
• Dual zipper design allows sleeping bag to open completely for greater temperature regulation
• Comes with ultralight stuff sack and breathable storage bag
• 3 lbs. 15 oz. Total Weight