Skinstri400 Men's Compression Sleeveless Top FrontPanels: Polyester 80% / Spandex 20% ; SidePanels: Nylon 76% / Spandex 24% Imported 76% Nylon, 24% Spandex Engineered gradient compression delivers more oxygen-rich blood to your active muscles - so you can train harder, play longer and recover faster. Glide through the water. Heat and pressure treated TRI400 fabric minimizes drag. Cold machine wash, gentle cycle, with like colors. Do not bleach, iron, or tumble dry.