The KSB 20s 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.

• 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