Klymit KSB 15 Degree F Sleeping Bag Grey Blue The KSB 15’s 650 fill power down top and synthetic fill bottom provides an exceptional warmth-to-weight ratio. Flexible Stretch Baffles keep fill next to your body and stretch when you move, while Length Locks™ allow you to adjust the bag to your height, creating a comfortable cocoon of fill around your feet. Additionally, anti-snag, two-way YKK zipper opens from the bottom or top to easily control the flow of air. Features: 650 fill power down top and synthetic fill bottom provides exceptional warmth-to-weight ratio Anti-snag, two-way YKK zipper opens from the bottom or top to easily control the flow of air Built-out foot box for plenty of comfort where it’s needed most Mummy hood with draft collar and draw cord reduces draft Packs down small with included compression sack Stash pocket located inside bag for easy access Klymit KSB 15 Degree F Sleeping Bag Grey Blue