Zoot Compressrx Endurance Active Long Sleeve Top nylon 80% Nylon 20% Lycra CRx - Graduated compression from the wrist to the shoulder reduces arm swelling and improves blood circulation back to the heart. EnduraRx: Nylon Spandex provides moisture wicking keeping the upper body dry and cool Machine wash cold, Gentle cycle, No softeners, Dry Flat, Do not bleach, Do not dryclean