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Base layer clothing refers to the first layer of clothing worn next to the skin, typically underneath outer layers. It is designed to provide insulation, moisture-wicking, and temperature regulation to keep the body warm and dry in various weather conditions. Base layer clothing is often made from materials such as merino wool, polyester, or synthetic blends to offer comfort, breathability, and odor control. This type of clothing is commonly used for outdoor activities such as hiking, skiing, and running, as well as for everyday wear in cold climates.