Base layers can serve a number of functions. They are ideal for use as women's leggings, providing additional support for your muscles whilst offering style and performance. They can be used as running leggings to keep you cool and dry but also offering extra insulation in the colder months. Capable of keeping you both warm and cool, helping your sweat to evaporate, they are an extremely versatile piece of clothing. Base layers can even be doubled up to give added insulation in especially cold environments, or worn under your other outdoor clothing to suit your needs.