WaveLoft construction and high-quality Thermolite® insulation are loftier and more durable for lasting warmth. Full-length YKK® #5 main side zip and foot box zip provide superior ventilation and allow the bag to be used as a comforter. Shaped hood and zipper draft tube keep the cold out and warmth in. Includes lightweight 70D nylon compression bag. Form a snug double sleeping bag by zipping to any Altitude, Journey or Venture sleeping bag.