fill power What is sleeping bag loft? How to breath life back into your bag We explain what sleeping bag loft is, where it goes, and how to get it back for cold nights on the trail What is fill power? Understand the insulating capacity of your down gear What is fill power? Understanding this term will help you choose the best insulated gear for staying warm on your adventures and we’re here to help Advnture NewsletterAll the latest inspiration, tips and guides to help you plan your next Advnture!Contact me with news and offers from other Future brandsReceive email from us on behalf of our trusted partners or sponsors MOST READ1Backcountry skier triggers avalanche that sweeps man down couloir, leaves without apologizing2Hundreds of boulders come crashing down, blocking popular long-distance trail in Yosemite National Park3New ultra-running startup launches shoes designed to handle hundreds of miles at a time4This powerful Garmin watch gives you personalized sleep coaching every night, and it's cheaper than ever right now5National Parks & Recreation? Watch Joshua Tree National Park reimagined as a sitcom