Kelty Camp & Hike Cosmic Ultra 20 Deg 800 Dridown Sleeping Bag – Womens Nightshade/Vapor Regular. Weve taken our top-selling Cosmic Bag and added a womens specific 800 fill DriDown version with all the perks too. The new trapezoidal baffle construction improves is ideal for retaining heatand its just one of the reasons Cosmic is still our favorite three-season superstar. We also love the natural-fit foot box for happier feet and a PFC-free water-repellent coating for a healthier environment.What makes it a womens bag? Its designed for and tested to womens specific ISO standards. Studies show that women sleep colder than men. So in addition to narrower shoulders wider hips and a shorter torso our womens bags have extra insulation in the upper body and footbox.