6″ Spacing/V-Block Side Baffle64″/39″ Shoulder/Foot GirthFull Down CollarInterlocking Draft Tubes9.5″ Loft, -25° F39 oz. Down Fill3 lbs. 10 oz. Total Weight

Known by Volcanologists the world over you’d think this Puma MF was filled with high lofting lava! 9.5″ of loft, 39 oz. of 850+ fill power down, two densely packed Interlocking Draft Tubes and a full down filled collar will keep you in the ring of fire till 25 below zero. Its VBlock Side Baffle provides phenomenal down control, so necessary in a bag with this much loft. You get a 66″ shoulder girth so that there’s even room for layering. The MicroLite XP™ shell has superior breathability while being extremely water resistant. This bundle of warmth weighs in at just 3 lb. 10 oz. total weight.

850 Plus Fill Power Goose DownWestern Mountaineering uses the highest lofting premium goose down available for all of our sleeping bags. Our fill power claim of 850 Plus is meant to be a realistic estimate given the variability of the product and the nature of fill power test methods. In reality, our certified tests most often are higher than what we claim. This is because the certified test methods provide the most optimistic fill power rating and do not represent what is being put into your sleeping bag. Recently, these testing methods for fill power changed again making the fill power ratings even higher. Now, each sample of down will receive a tumble dry before it is given several days to loft up in a perfectly controlled environment. During that time it is enhanced by using a blow dryer to boost loft. Your sleeping bag will never receive that kind of treatment, and this is why we claim a more practical fill power. Rest assured, we use only the finest goose down available.Microlite XP™Our new 20 Denier MicroLite XP™ microfiber reduces the total weights of the bags in this series by 15 to 20 percent! It is the highest threadcount fabric we have ever used with over 400 threads per square inch. We have worked closely with our supplier to develop this new fabric which is highly water resistant, highly breathable, and very light weight. Its hard to imagine a more impressive combination of performance characteristics in a shell fabric.What Is Microfiber?A microfiber fabric is very water resistant because of its combination of high thread count and makeup of dense yarns. Each micofiber yarn has many more filaments than a normal nylon or polyester yarn of equivalent size. Woven into high thread count material, it becomes a fabric that really keeps wind and water out. Since there is no coating or laminate on the material, it is highly breathable. The fabric construction is responsible for weather proofness, it’s not something that can wear off, wash out or delaminate. This is the most technologically advanced non-laminated weather resistant fabric available. Look for bags with a microfiber shell if you expect some contact with moisture.

YKK ZippersWe use a #5 YKK coil zipper with two dual direction pulls and locking head. This zipper is lighter weight and less bulky than the old #7 zipper. The coil construction has a less abrasive surface in the event of zipper snags and provides years of trouble free operation.Baffle MaterialPre-cut no-see-um netting is what we use for all internal baffles. This material is firm to prevent distortion, but flexible enough to insure compressibility. It is extremely lightweight and durable.Water Repellent TreatmentsAll of our fabrics are finished with a DWR, (Durable Water Repellent) that is rated as 80/20. This is an industry measure of durability that suggests that 80% DWR is retained after 20 washings. In reality this rating is for laboratory test procedure only and is not realistic for home washing.

Added together, it’s all these little details that make a great sleeping bag and push Western Mountaineering over the top! For instance, all of our winter bags with the Full Down Collar are made with Interlocking Double Draft Tubes. When the bag is zipped these large stoutly filled tubes rest side by side rather than on top of each other. That way these Interlocking Draft Tubes retain their full loft without being compressed as the zipper closes. When a bag has a single draft tube it will hang from the top so that the zipper won’t inadvertently be exposed while moving inside the bag. A Dacron stiffening tape is sewn alongside each zipper to prevent snags. Our Hook and Loop closures are backed with fabric to prevent fraying and are placed on non-integral parts of the bag like the draw cord casing.We have created a series of icons that represent features found on Western Mountaineering sleeping bags. At a glance you will be able to tell which bags have single or double draft tubes, passive or full down collars, continuous baffles and the type of side block baffle. These icons appear throughout the catalog for each sleeping bag.

All Western Mountaineering® products are guaranteed against manufacturer’s defects for an unlimited time. Should a product fail due to a defect in materials or craftsmanship, we will, at our option, repair or replace the item at no cost to the original owner. We will make the determination of what will be covered under warranty at the time that we inspect the product. This guarantee does not cover normal wear and tear, misuse, or improper laundering. This guarantee does not cover accidental punctures, tears, rips, burn holes, damage by rodents, or deterioration of the materials caused by excessive sunlight exposure, mold or chemicals. We will not repair a product if we determine that it isn’t clean. WE WILL ONLY REPAIR SLEEPING BAGS THAT HAVE BEEN THOROUGHLY LAUNDERED OR ARE OTHERWISE RECEIVED IN VERY CLEAN CONDITION. HEAVILY SOILED OR DIRTY SLEEPING BAGS WILL NOT BE ACCEPTED FOR REPAIR.