Choosing a sleeping bag that is suitable for winter camping is as easy as checking the product specifications before purchase. Because all sleeping bags come with what is known as a comfort rating, it is possible to get a good idea of what temperatures the bag will be able to handle before becoming too cold.
In addition, sleeping bags are most often designated with a season rating. This is a number usually included in the product title that lets you know what time of year the bag is designed to be used. For instance, a three-season bag will be adequate for chilly spring and fall conditions, but not quite warm enough for year round use. Intrepid adventurers looking to do some camping in winter will want to consider a four-season bag.