The women’s sleeping bag is typically a few inches shorter that the unisex regular length, is not as broad through the shoulders, has a little more room in the hips, and sometimes has additional insulation on the top layer in the thoracic area in the foot area, and possibly other places. The extra amount of insulation varies by style/design, so there is not a hard and fast rule as far as how much extra insulation a particular women’s sleeping bag receives. Usually women's bags are rated for comfort and men's bags are rated at survival rate since women tend to get colder than men.