The Alaska Range is nowhere to make a bad gear choice. The Western Mountaineering Bison Infinium, with its 10 inches of heat trapping loft and Gore Infinium shell, is what it takes to stay warm at the 14,000 ft. camp on Denali. Nearly impervious to the elements, while remaining lightweight, the Western Mountaineering's Bison remains the most sought-after expedition quality sleeping bag.

• Gore Infinium shell reduces the threat of condensation and moisture while remaining breathable
• A slightly over-sized winter fit ensures comfort when extreme weather necessitates an extra layer or two
• The massive Reverse Differential Hood with an added external hood ruff seals in warmth
• A full 3-dimensional down filled collar full provides a protective seal from the bellows effect as you move about inside your bag
• Enjoy easy ventilation with a full-length #5 YKK Coil Zipper featuring two locking slider pulls for convenient access from inside or outside the bag