Zoot Compressrx Endurance Active Short nylon 80% Nylon 20% Lycra CRx - Graduated compression from the knee to the waist that helps remove lactic acid improve blood circulation back to the heart; EnduraRx: Nylon Spandex provides moisture wicking and keeping the lower body dry and cool Machine wash cold, Gentle cycle, No softeners, Dry Flat, Do not bleach, Do not dryclean