The Western Mountaineering Puma Super DL -20F Sleeping Bags 8.5 inches of loft and Gore-Tex DryLoft shell offer uncompromising warmth and performance help mountaineers and backcountry skiers travel light on expeditions or winter camping trips in brutally cold conditions. This winter mummy bags 35 ounces of 850 fill down provide an immense 9 inches of loft to keep you warm to 20 below zero and keep the of the Puma Super DL down to 3lb 10oz. Western Mountaineering made the Puma Super DL Sleeping Bags exterior, draft tubes, and hood out of wind- and water- resistant DryLoft fabric to protect the down fill from condensation and moisture from tent or snow cave walls. The Puma Super DL roomy cut accommodates larger folk and provides extra space for layers. The foot section of the bag features heavier duty fabric to protect the bag while storing water bottles and other gear overnight.