Insulated with RDS-certified, 850+ fillpower goose down with a non-PFAS Ultra-Dry Down treatment, the Ember quilt was designed for multi-season use with an excellent warmth to weight ratio. In warmer conditions, the ability to easily ventilate keeps you comfortable. As temperatures drop, the drawcord footbox helps you retain warmth and the light, breathable 10D nylon shell fabric is treated with a non-PFAS DWR finish to repel moisture, while the 10D nylon liner fabric is there to deliver pure comfort. The Ember is easy to secure to your sleeping mat with the attached straps or add it to your Sea to Summit sleeping bag using the integrated QuiltLock system for a thermal boost in colder weather.