Marmot's Mt. Tyndall Jacket is plenty warm for hut trips, ice climbs, cold crags, and brisk mornings at the campsite. We wear it all winter, really. From scraping ice off the windshield to braving frosty streets to climb at the gym, the Mt. Tyndall's 800-fill down insulation adds heavyweight warmth without weighing us down. It's so lofty and compressible that we can pack it for any trip whether we're heading to cabins or climbs.