Therm-a-Rest Questar Sleeping Bag

The 20-degree rating indicates the limit at which the bag is designed to keep an average sleeper warm. If you are a cold sleeper, you may want to pair this with a thermal liner or base layers when temperatures approach that lower limit.

The W.A.R.M. fit is slightly more generous through the shoulders and hips than a traditional mummy bag. This extra room allows you to sleep on your side or with your knees bent without compressing the insulation or feeling restricted.

The SynergyLink Connectors work best with standard-sized rectangular sleeping pads. They are designed to keep the bag centered on your pad throughout the night, preventing you from rolling off onto the cold ground.

The 650-fill Nikwax Hydrophobic Down is treated to absorb significantly less water and dry faster than untreated down. While it handles damp environments and condensation well, it is not waterproof, so you should still use a dry bag or pack liner to protect it during heavy rain.

This is an insulated, ergonomic pocket at the bottom of the bag specifically designed to warm up cold feet quickly. It provides extra loft and insulation in the area where heat loss is often most noticeable.

While it is rated for 20 degrees, its suitability for winter depends on your local climate and your personal cold tolerance. It is a versatile 3-to-4 season bag, but for extreme sub-zero winter expeditions, you might need a bag with a lower temperature rating.