What Our Gearhead(R) Experts Are Saying:"I used the Bishop Pass Windstopper 15F on a chilly Sierra trip and it really held its own. The WINDSTOPPER(TM) shell stopped the wind cold at 11,000 feet, and the 650-fill down kept me toasty without feeling bulky. It's a solid three-season bag that punches above its weight."When our adventures stretch into colder, windier territory, we pack the Bishop Pass Windstopper 15F Sleeping Bag to make sure our nights are as comfortable as our days are rugged. The GORE-TEX WINDSTOPPER(TM) shell takes the edge off howling wind and condensation-heavy bivy spots, keeping the 650-fill down insulation dry and lofty no matter the weather. Inside, we settle into a Performance Plus mummy fit with a contoured footbox, shaped draft collar, and down-filled face gasket that works to hold warmth close and eliminate heat loss at key points. This bag is breathable, water-resistant, and light enough to bring deep into the mountains, whether we're posting up at alpine lakes or waiting out storms at basecamp. A snag-free YKK zipper, internal stash pocket, and both storage and compression sacks round out a complete backcountry-ready package.