Women's Lamina 30F/-1C Sleeping Bag - RegUnique Lamina construction maximizes the loft of your insulation; eliminates cold spots; and thermally maps insulation to areas you need the most warmth. By strategically placing insulation, we are able to concentrate warmth where you need it. Features: Proprietary, welded Lamina construction enhances loft and eliminates cold spots Standard mummy cut is efficient , warm and comfortable Shaped draft collar blocks the escape of warm air from inside the