The Big Agnes Sidewinder SL 20° Sleeping Bag is a revolutionary, patent-pending sleeping bag specifically engineered to accommodate the natural sleeping position of side sleepers. The Sidewinder SL’s design moves seamlessly with the body, eliminating the constrictive feel of traditional mummy bags and preventing cold spots that often occur when side sleepers roll over. This regular size bag is filled with a combination of 650 fill DownTek™ water-repellent down and synthetic FireLine™ ECO insulation, providing a superior warmth-to-weight ratio and reliable performance even in damp conditions. Key features like a jacket-style hood, a contoured mummy shape that’s more spacious at the torso, and a unique pillow barn make this a comfortable and highly functional 3-season bag.

Key Features:

Side-Sleeper Specific Design: Patented construction allows the bag to move with you as you roll from side to side, providing comfort and consistent warmth.
Insulation: A blend of 650 fill DownTek™ water-repellent down and FireLine™ ECO synthetic insulation. The down provides exceptional warmth, while the synthetic fill is strategically placed to alleviate common pressure points at the hips and feet.
Temperature Rating: Rated for 20°F (-7°C), making it a reliable choice for 3-season backpacking and camping.
Hood & Pillow Barn: A close-fitting, jacket-style hood keeps insulation close to your head, and a built-in Pillow Barn secures your pillow in place.
Zipper & Draft Control: An ambidextrous, anti-snag zipper allows for smooth operation, and a no-draft collar seals in warmth.
Regular Size: Designed to fit users up to 6’0″