Quick Answer
Vapor barrier clothing is preferred by some survivalists over regular layers because it prevents moisture buildup, reducing the risk of hypothermia in cold and wet conditions. Vapor barriers prevent sweat from penetrating to the skin, unlike regular layers that absorb and retain moisture. This results in a drier and warmer body temperature.
Why Vapor Barriers Work
Vapor barriers are specially designed clothing that prevents moisture from passing through to the skin. They are typically made of thin, waterproof materials such as nylon or polyester, often treated with waterproof coatings like Gore-Tex or eVent. These materials allow for excellent breathability while keeping water and moisture out, allowing for a dry and comfortable body temperature.
Choosing the Right Vapor Barrier
When selecting a vapor barrier, look for clothing with a water column pressure rating of at least 20,000 mm (approximately 20 kg), which ensures the material can withstand water pressure. Choose clothing with a breathable membrane that allows moisture to escape, such as Gore-Tex or similar technology. Avoid clothing with a waterproof but non-breathable membrane, as it can lead to condensation and moisture buildup.
Best Practices for Wearing Vapor Barriers
To maximize the benefits of vapor barrier clothing, wear it as an outer layer in cold and wet conditions. Avoid wearing vapor barriers in warm and dry environments, as it can lead to overheating and discomfort. When wearing a vapor barrier, make sure to wear a moisture-wicking base layer to prevent sweat buildup under the vapor barrier. This will keep you dry and comfortable while maintaining a stable body temperature in harsh environments.
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