Sea to Summit's Flame sleeping bag range is designed specifically for women, offering high comfort with lightweight performance for a demanding range of uses. All Flame sleeping bags feature ultra-light weight and minimal pack size, as well as excellent thermal performance. In the Flame FmII, the continuously sewn vertical box chambers in the chest area contain an extra amount of down for extra warmth. Continuously sewn horizontal chambers in the foot area minimize weight. A half-zip with two sliders allows easy entry and provides additional ventilation. Optimized sizing provides more room at the shoulders and hips, and the zipper channel prevents heat loss. Includes thermal collar.Ultra-Dry DownUltraDry Down is a PFC-free, water-repellent down treatment used in all Sea to Summit sleeping bags. UltraDry Down retains over 60% more fill power, absorbs 30% less moisture, and dries out 60% faster than untreated down - meaning it insulates better even when damp. The treatment also inhibits bacterial growth and extends the life of your sleeping bag.