The zero degree sleeping bag has become somewhat of a staple for any cold weather hunt. The HyperLamina 0 represents the latest weight shaving and redesign from Mountain Hardwear's gear lab. Expertly designed and lighter by far than the majority of synthetic 0 degree sleeping bags this bag sets the bar high. Filled with Thermal.Q synthetic this bag is perfect for late season moose, goat or spring bear hunts. Inclement weather is a sure thing, and you arent wearing rubber rain gear because its comfortable. When you stumble back to the tent you need a sleeping bag that will actively pull moisture from your body and clothing (something that waterproof down will not do) and keep you warm at the same time. The HyperLamina 0 uses welded seams to prevent bunching of insulation and pesky cold spots. If you have a cold weather hunt coming up take a hard look at the Ultra Lamina 0.