Skirts for exercise should be form-fitting and happily stretchable. Blends made of polyester or nylon are great options since they often include performance characteristics like anti-wrinkling, rapid drying, moisture-wicking, and even UPF or odor resistance. Moreover, they are often machine-washable, which simplifies cleaning. Seek mixes that include elastane or spandex for more flexibility and softness that will give you more mobility.