The sleeping bag is designed for your comfort. It?ˉs filled with multiple layers of microfiber insulation to keep you warm. Body mapping technology provides extra fill in specific areas so you sleep comfortably. The built-out foot box is more comfortable for your feet. Rated to well below freezing and has a 3-piece hood that contours your face and can cinch down tightly for added warmth. Full-length zipper draft tube keeps the warm air from escaping. Each bag comes with its own matching compression sack. Whether you are a new to backpacking or are an expert backpacker, the Sleeping Bag is perfect for you. It?ˉs ultralight and compresses down into its stuff sack to fit nicely in all Sports internal frame and ultralight packs. The well-constructed LEEF is made from a sturdy ripstop fabric that is water resistant and won?ˉt tear, even if punctured. The brushed polyester lining feels like soft bed sheets?athe inside of this ultralight mummy bag is incredibly comfortable! Taped, anti-snag zippers are easy to close from inside or outside of the bag. Also has a secure interior zip pocket for wallet or keys.?