Big Agnes Sidewinder 20deg Sleeping Bag Side Effects May Include Feeling Well Rested Finally, a sleeping bag designed specifically for side sleepers who roll from one side to the other through the night. The Sidewinder 20deg pairs lofty 650-fill RDS-certified down insulation with strategic patterning that moves with your body, delivering lightweight, packable comfort and dependable three-season performance on the trail. The optimized profile and thermally efficient footbox mimic your natural sleeping position, while water-resistant down and strategically placed synthetic insulation keep you warm and dry through all-condition adventures. Features Technical side-sleeping patterning allows the bag to move and flex as you roll, eliminating twisted fabric and tangled discomfort650-fill RDS-certified Downtek with strategic synthetic padding at knees, hips, and shoulders provides warmth-to-weight efficiency with weather-resistance and pressure relief Cinchable hood and anti-draft zipper seal in warmth while the extended footbox provides complete coverage for side-sleeping comfort SPECIFICATIONSIntended Use Backpacking, Camping Season3-season Temperature Rating20degF / 7degC (Comfort: 30degF / -1degC | Limit: 19degF / -7degC)Insulation - Primary650-fill RDS-certified Downtek with PFC-free hydrophobic treatment Insulation - Secondary Fire Line ECO Synthetic (100% post-consumer recycled polyester)Shell Material Recycled polyester ripstop with DWR finish Liner Material Recycled polyester taffeta with DWR finish Includes Stuff sack and storage sack SIZE CHARTSize Fits Up To Girth (shoulder, hip, foot)Total Weight Fill Weight Packed Size (compressed)Stuff Sack Size Small5'6"58", 52", 33"2 lb 4 oz / 1. 02 kg14 oz Down + 6 oz Synthetic / 390 g Down + 170 g Synthetic9. 5" x 8"14L / 8" x 17. 5"Regular6'61", 55", 36"2 lb 7 oz / 1. 10 kg15 oz Down + 6. 5 oz Synthetic / 420 g Down + 183 g Synthetic10" x 8"14L / 8" x 17. 5"Long6'6"64", 58", 49"2 lb 11 oz / 1. 23 kg16. 5 oz Down + 7 oz Synthetic / 470 g Down + 200 g Synthetic10. 5" x 8. 5"14L / 8" x 17. 5" | Big Agnes | Sidewinder 20deg Sleeping Bag | Polyester