Dress shirts for men: 20% Bamboo Fiber, 75% Tencel and 5% Spandex Imported Button up closure Hand Wash Only 1---DESIGN: this stylish formal/casual mens dress shirts features a button down collar and long sleeves. The collar fabric is thicken for a sharp looking. This shirt embraces both modern and traditional style to embody the confidence and coolness of men's fashion. 2---OCCASION: These long sleeve dress shirts for men are suitable for both casual and formal occasion, such as meeting and party. For casual occasion? Just take the shirts in bright colors and just let the collar open. More dressy? Take them in classic colors, such as black and white. A dress shirt with slacks and suit jacket will work amazingly well. 3---WASH CARE: Machine/ hand wash in water below 30 degrees. Low iron. Please wash it with similar colors. 4---SIZE GUIDE: All the size data are about garment measurements, NOT body measurements.