These men's casual shirts are great for everyday wear. You can pair them with jeans for a laid - back look or with dress pants for a more business - casual style. When it comes to sizing, remember to check the size chart carefully as different suppliers may have different sizing. If it's an Asian - sized shirt, go for a bigger size. To maintain these shirts, you can machine - wash them in cold water. Use a gentle cycle and mild detergent. Hang them to dry to keep the shape intact. Avoid using bleach as it can damage the fabric. These shirts are made of polyester and spandex, which makes them breathable and comfortable all day long.