The Bristlecone MF sleeping bag from Western Mountaineering is a semi-rectangular bag designed for sub-zero temperatures. Ideal for most winter conditions Bristlecone 850 down insulation has the highest fill rate which provides the highest warmth to weight ratio available on the market. Unlike most waterproof cases Micro
Lite XP fabric from Western Mountaineering provides long-lasting weather protection. Micro
Lite XP shell helps down keep warm in humid conditions.
Western Mountaineering critically thought through the design of the bag down to the smallest detail making Bristlecone a durable and highly versatile choice. Differential cut allows more fabric to be placed on the lining to ensure maximum volume inside the bag and solid baffles allow the bag to be moved down to the top or bottom for more or less warmth. Velcro loops allow you to tighten the hood draw tube and pull collar further or closer to you for customized coverage. Additional convenience features include dual zippers on the left or right side , waterproof stuff sack and spacious storage bag which helps the bag maintain its volume over time.