Thank you for viewing. These tights are made of stretchy fabric for a comfortable fit. They are also breathable. I used to have knee pain from running with poor form during marathons, but the support of these tights is excellent, and the pain is almost gone. There are no noticeable scratches or stains, but there is overall fine pilling from the buttocks to the thighs. Please refrain from purchasing if you are concerned. - Color: Black - Material: Nylon, Polyester, Polyurethane - Gender: Women's - Length: Long - Features: Compression Generator Model (Revolution Type) [Coolmax Fabric] CW-X's high-support model. Recommended for sports with high stress on the body, such as marathons, ball games, skiing, and snowboarding. The seams of the support lines have been eliminated to pursue lightness and comfort. Support areas: buttocks, waist, hip joint, knee, thigh, calf Design: CW-X's unique step compression design Protects the knees from the impact of landing and reduces muscle fatigue during exercise. Uses sweat-wicking and quick-drying "Coolmax Fabric" for a refreshing feel. The hem is finished with an overlock process.