If you find yourself in the wilderness, staying dry is extremely important for your health and hygiene. Wearing wet clothes can contribute to some illnesses. In cold climates, staying dry is necessary for avoiding hypothermia. Having an extra set of clothes in your water-proof bag is a smart idea.
If you know ahead of time that you are going into a wet and possibly cold climate, you should invest in some waterproof gear. Note that water-resistant gear is not the same thing. Water-resistant gear can help you stay dry in light rain for a little while. However, for more severe and long-lasting weather conditions, waterproof gear is the way to go. Waterproof gear is typically a little heavier than water-resistant gear. Waterproof fabrics shed water because they have been treated with a waterproofing agent or because of how the fabric is woven or what it is made out of.
Image by Ed Yourdon
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