When engaging in outdoor activities, it’s common to see many people simply buying a sleeping bag with an appropriate temperature rating and thinking that’s enough. But outdoor gear is meant to be used as a system, much like building a custom PC—only the right combination delivers optimal performance. Yet in reality, we often see people using three-season tents with down sleeping bags and egg-crate sleeping pads in low temperatures. Using unsuitable gear in the wrong season naturally leads to feeling cold.
Several Notes on How to Wear a Sleeping Bag for Outdoor Camping:
1. The most common issue is the incorrect use of sleeping bags. Sleeping bags rated for temperatures below 0°C usually have a chest wall design that allows you to tighten both the hood and the chest area, creating double insulation. Yet it’s common to see people not zipping up their sleeping bags or failing to cinch the drawstring properly—how can they not feel cold halfway through the night?! Also, sleeping bags shouldn’t be kept in their compression sacks for long periods when at home. They should be unpacked to maintain their loft, which helps preserve their insulating properties. It’s best to air them out for a day or two before each use.
2. There are many types of sleeping pads. Taking the aforementioned down sleeping bag paired with an egg-crate pad as an example: while down sleeping bags offer excellent breathability, egg-crate pads are designed to increase the air layer between your body and the ground—and air is a poor conductor of heat... So what happens when you use them together? The moisture released from the sleeping bag quickly turns into water, and because egg-crate pads tend to absorb moisture due to their material, you end up feeling colder the longer you sleep.
3. Tents come in three-season and four-season types. A three-season tent’s inner layer is essentially like a mosquito net—well-ventilated and breathable, so its insulation in cold weather is self-explanatory... As for four-season tents? Based on experience camping at the summit of Mount Tai during Christmas with temperatures around -15°C and light snow, my friend staying in an Air Force guesthouse nearby had rooms with double-glazed windows. After one night, their 1.5L bottles of Nongfu Spring water were frozen solid, yet our 1.5L bottles inside the four-season tent remained completely unfrozen.
4. When camping outdoors, your body tends to get cold starting from the feet. To prevent this, you can wear your fleece or down jacket, zip it up, then insert your feet from the waist area upward before climbing into the sleeping bag. This ensures your feet stay warm, helping you sleep through the night—or even wake up feeling too hot sometimes. Bring an aluminum water bottle and fit it with an elastic sleeve. Boil water before bed, pour it into the bottle, and place it inside the sleeping bag. Voilà—you’ll have lukewarm water to drink the next morning. Take any clothes you’ve taken off but don’t need, roll them into a long, stick-like shape, and place them beside your body to add insulation between the sleeping bag and the tent, slowing down heat loss. Wearing a warm hat—preferably fleece—will keep your head cozy all night, preventing colds.