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Sleeping bags come with a variety of fillings and temperature ratings. Sleeping bags stuffed with goose down are incredibly warm but lose their insulating capability if the down becomes wet. They work best in dry cold conditions. Synthetic materials like the Holofill, on the other hand, dry quickly and can still keep you moderately warm even if they become damp.
A temperature rating is displayed on the tag of most sleeping bags. A sleeping bag with a rating of 0° C (32° F) should keep a camper comfortable at temperatures above 0° C. Each manufacturer has their own ratings. There is no set rating for the industry. Ratings can be misleading because they vary among sleeping bag manufacturers. When selecting a sleeping bag, purchase one with a rating 10° to 20° lower than the anticipated temperature. A mummy sleeping bag is also an item to consider, it has a flap covering the neck and head. Mummy bags are close-fitting, leaving less cold-air space within the bag compared to rectangular bags.
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