Sea To Summit Spark Women's -1C sleeping bag is designed for women who desire minimal weight but maximum comfort in their adventures. The Spark line for women demonstrates Sea to Summit's 100% commitment to creating a perfect sleeping bag for you. The women-specific shape and body mapping ensure warmth and comfort without added weight. The certified RDS 850+ goose down treated with an Ultra-Dry Down non-PFC treatment provides superior insulation, while a technical hood and anti-draft tube in the zipper prevent precious warmth from escaping. A super-breathable 10D inner fabric completes the comfort profile, and a 10D shell with a non-PFC DWR combined with a highly water-repellent fabric for the hood and footbox keeps moisture away. Couples can pair the Women's Spark with an equivalent Unisex Spark for extra comfort and thermal efficiency along the entire length of the zipper.