This running compression shorts provides enough compression, minimizes muscle bouncing, increases the oxygen around thighs, reduce muscle fatigue and soreness while exercising. 85% Polyester, 15% Spandex. Light, soft, smooth, and skin-friendly fabric reduces chafing around thighs, won't ride up or slip down, brings you maxmium comfort. polyester spandex Machine Wash Fastening: Pull On Sport shorts Fitted Moisture wicking, quick drying and breathable. Keep you cool and comfortable when doing exercise. Thick elasticated waistband with high stretchy material for excellent flexibility and maximum freedom of movement. Suitable for your indoor and outdoor activities, such as running, cycling, football, baseball, weight training and so on.