Cotton is the most breathable fabric and allows the moisture to escape your body. While you wear your moisture-wick shorts next to the skin, the cotton allows for air movement. Our workout tights/leggings are made out of wicking material. The skirts just need to breathe, allowing your body to stay cool. While conducting research and development, we tested the skirts while biking over 400 miles in 104 degree weather. They performed fantastically and had very little lingering wetness. Thousands of women have worn the skirts during running events, from 5Ks to half and full marathons, to Ironman races.