Skinstri400 Men's Compression Sleeveless Suit FrontPanels: Polyester 80% / Spandex 20% ; SidePanels: Nylon 76% / Spandex 24% Imported 76% Nylon, 24% Spandex Ride harder. Lightweight TRI400 chamois provides maximum protection with a slim profile. 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.