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The comfort temperature indicates the temperature at which a person is comfortable and does not feel the cold in their sleeping bag.
The comfort limit temperature indicates the temperature at which a person must curl up to avoid feeling the cold.
The extreme temperature indicates the temperature at which a person is likely to feel the cold in their sleeping bag, and may run the risk of hypothermia.
The sarcophagus sleeping bag is designed to optimize thermal protection by conforming to the shape of your body. It's often lighter and more compact, making it a preferred choice for trekking activities where weight and space are important.
The rectangular sleeping bag, or blanket sleeping bag, offers more space and comfort, especially for the feet. However, because of its wider shape, it offers less effective thermal protection, as there is more air inside the bag. These bags are therefore generally recommended for summer or spring camping, when temperatures are milder.
Avoid layering too many items of clothing inside your sleeping bag. In cold weather, leggings and a warm long-sleeved top should suffice.
Protect your extremities by wearing a hat, gloves and socks when temperatures are low.
Make sure you have good insulation between the ground and your sleeping bag by using a suitable camping mattress to protect you from the cold coming from the ground.
If your sleeping bag gets wet, ventilate and dry it as quickly as possible to avoid losing its insulating properties.
For added comfort and/or warmth, consideradding a sleeping bag sheet, ideally made of silk, to increase thermal insulation.
If you have a down sleeping bag, it's best to store it at home, out of its compression cover, to preserve its loft.
When washing your sleeping bag, follow the manufacturer's instructions, usually printed on the bag's label. Most sleeping bags can be machine-washed on cold, but it's important to follow the specific instructions.