Spark Pro Down Sleeping BagThe Spark Pro has been optimized for comfort, versatility and light weight. Our highest lofting down 900+ fillpower RDS certified goose down with a non PFAS Ultra Dry Down treatment is wrapped in extremely breathable 10D fabrics. The Free Flow Zip system ensures maximum ventilation and the flexibility to open the bag flat as a quilt. Zip a Spark Pro to a Women's Spark and share the comfort with your companion. Features RDS certified, 900+ fillpower