Product details:

Designed for cold weather backpacking and winter camping, the Therm-a-Rest Questar 0 Degree sleeping bag is insulated with premium 650-fill Nikwax Hydrophobic down and employing a number of thermally-efficient and comfort-enhancing features. Down insulation has long been renowned for its compressible properties and efficiency in delivering an excellent warmth-to-weight ratio. The shortcoming of down has been its susceptibility to the effects of moisture, losing much of its performance qualities when wet or damp. Nikwax Hydrophobic down insulation provides water-repellency that keeps the insulation dry longer and allows it to dry faster if it should become wet. More importantly, it maintains thermal efficiency even if it becomes wet, a quality that could traditionally only be found in heavier, less-compressible synthetic fills. Box baffled construction helps to maximize the insulation's loft and keeps the down from migrating within the bag which could otherwise lead to cold spots and inconsistent warmth. Additionally, the bag has 'zoned' construction, concentrating insulation on top of the bag so you have warmth wear you need it most and saving weight by minimizing insulation on the bottom of the bag where it just tends to get compressed beneath the weight of your body anyway. Other features include an insulated hood, snag-free zippers, a tilted comfort/warmth-enhancing toebox, SynergyLink Connectors to marry the bag to your sleeping pad (pad sold separately), an insulated draft collar, an zipper draft tube to keep cold air from reaching the interior of the bag, additional foot-warming insulation inside the bag to address an area most prone to heat loss, and a zippered exterior pocket for stowing valuables. The Therm-a-Rest Questar 0 Degree sleeping bag is available in your choice of Small (fits up to 5' 6'), Regular (fits up to 6' 0'), and Long (fits to 6' 6') lengths. A stuff sack and storage sack are included.