Winter sleeping bags
— sleeping bags are generally considered suitable for winter, in which the t ° comfort limit (see the relevant paragraph) is not higher than zero. An exception is models with a very low extreme temperature (-20 °C and below): for such products, a plus t ° comfort limit is also allowed. However, the second option is very rare and is designed mainly for warm winters and off-season. And models in which t ° comfort does not exceed -5 °C are winter by definition.
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