How To Buy A Sleeping Bag -

A survival-only rating indicating the temperature at which a standard woman can survive for six hours without hypothermia; it is not a comfort guide.

Insulated tubes along the zipper and around the neck to prevent warm air from escaping.

Generally cheaper, hypoallergenic, and continues to insulate even when damp. The downside is that it is bulkier and heavier than down and its warmth can diminish over time as fibers break down. 3. Finding the Right Shape

Choose a bag with a rating 10–15°F lower than the coldest temperature you expect to encounter. 2. Choosing Insulation: Down vs. Synthetic