As temperatures plummet toward the negatives and most people cozy up next to their fireplaces, we pack up our Mountain Hardwear Lamina -20F Sleeping Bag to enjoy the quiet serenity of the snow-laden woods. The durable bag is fully equipped to handle all the challenges of setting up a winter camp, with synthetic Temperlite insulation that maximizes thermal efficiency and maintains heat even while wet. Bidirectional bonded insulation eliminates cold spots and is targeted to provide warmth around our core and feet to minimize heat loss overnight. We can cinch down the hood to keep warm air trapped inside the bag, and the double draft collar blocks cold air so we can sleep comfortably in frigid conditions.