600-fill-power PFC-free DownTek™ water-repellent down insulation keeps you cozy and warm DownTek insulation absorbs 30% less water and dries 60% faster than untreated down, and it retains significantly more loft than untreated down after exposure to moisture Contoured hood follows the shape of your head for a more comfortable fit; low-profile cordlock lets you uncinch the hood with one hand No-draft collar and zipper seal out cold weather; insulated tube along upper hood opening keeps out drafts when cinched Dual zipper sliders on patent-pending expandable panels allow you to make multiple fit adjustments or to expand overall bag circumference by 10 in. Durable water repellent (DWR) finish on fabric resists moisture and stains Interior fabric loops help you attach a sleeping bag liner (not included) Exterior loops for hang drying or storage; includes storage sack and stuff sack for easy transport and stowage Zip together left-zip and right-zip bags to make a double sleeping bag (additional bags not included)