Homonym: base layers (Apparel)
Base layers are the first layer of clothing worn next to the skin. They are designed to wick moisture away from the body, keeping you dry and comfortable during physical activities. Common materials for base layers include synthetic fabrics like polyester and natural fibers like merino wool.
These layers come in various styles, including tops, bottoms, and even full-body suits. Base layers are essential for outdoor activities such as hiking, skiing, or running, as they help regulate body temperature and provide insulation in colder conditions.