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Built for women who want minimal weight but maximum comfort in their adventures, the women's Spark series demonstrates Sea to Summit's 100% commitment to building a sleeping bag that's made perfect for you. Women's-specific shape and body mapping result in warmth and comfort without the weight. RDS-certified 850+ fillpower goose down treated with a non-PFC Ultra-Dry Down treatment provides superior insulation, while a technical hood and zipper draft tube prevent precious warmth from escaping. A super-breathable 10D liner fabric rounds off the comfort profile, and a 10D shell with a non-PFC DWR combined with a highly water repellent hood and footbox fabric keep moisture out. Couples can zip the full-length zipper women's Spark to an equivalent unisex Spark for extra comfort and thermal efficiency.