Therm-a-Rest Parsec(TM) 20F/-6C Sleeping Bag One Bag, Three Seasons The Parsec(TM) 20F/-6C is the bag for backpackers who want a single, capable bag that handles everything from shoulder-season alpine nights to shoulder-season lows without reaching for a liner or adding a quilt. The fill is 800-fill Nikwax Hydrophobic Down(TM), which resists moisture and recovers loft faster than untreated down - a real advantage when condensation builds up inside a tent at altitude. Heat-mapped Zoned Insulation concentrates fill where you lose heat first and trims it where it just adds bulk, keeping the bag light without sacrificing its 20degF rating. Synergy Link(TM) Connectors keep the bag attached to your sleeping pad through the night, so you stay on your insulation instead of rolling off it. Features800-fill Nikwax Hydrophobic Down(TM) absorbs 90% less water and dries 3x faster than untreated down Heat-Mapped Zoned Insulation concentrates fill in priority warmth areas for an efficient warmth-to-weight ratio20-denier GRS-certified 100% recycled nylon shell lightweight, durable, and eco-friendly Synergy Link(TM) Connectors secure the bag to your sleeping pad to prevent roll-off and maintain thermal efficiency | Therm-A-Rest | Parsec(TM) 20F/-6C Sleeping Bag | Nylon