Even at 0 degrees F, the Voodoo Tactical ZERO Degree Mummy Sleeping Bag will keep you warm. The double layer construction and 4 pounds of hollow fill Micro-Fiber loft keeps you from suffering the elements. The chest baffle, head and shoulder draft collars and zipper draft tube keeps the cold out and the heat in. The inside pocket is perfect for phone or flashlight. The compression stuff/storage sack keeps the bag small and easy to carry.