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Wicking layers can be made of synthetics, such as polyester, polypropylene,and proprietary brand fabrics made and used by individual companies. They can be natural fabrics, such as wool and silk. And they can be blends of natural and synthetic fibers. Their function is to transport moisture away from the body. Wicking layers can help keep hikers and other outdoorspeople comfortable year-round.
In three-season hiking (spring, summer, and fall), backpackers typically wear shorts and T-shirts during the day. A T-shirt made of a wicking fabric will move sweat away from the skin, while a cotton T-shirt, will simply soak through and can cause rashes, especially if pack straps or waistbelts are rubbing. Popular choices are Capilene (a proprietary fabric used by the outdoor clothing manufacturer, Patagonia) and a variety of different polyesters.
In particular, women might want to choose wicking bras or sports bras, which are available in sporting goods stores or through catalogs specializing in women's athletic wear.