The Spark Down Sleeping Bag provides warmth and comfort without the weight. Responsibly sourced down insulation and a technical hood work to retain warmth. Its super-breathable liner fabric creates a comfortable space, while the water-repellent shell keeps moisture out. Couples can zip the full-length zipper to an equivalent sleeping bag for extra comfort. If a great night's sleep is a priority, even when counting grams, this bag may be ideal.