These casual long - sleeve shirts for men are super easy to wear. Just slip them on like you would with any regular shirt. When it comes to sizing, as mentioned in the product description, always check the size chart because different suppliers may have different measurements. If it's an Asian - sized shirt, go for a bigger size to ensure a comfortable fit. To keep your shirt in great condition, machine - wash it on a gentle cycle with cold water. You can also dry it on a low - heat setting in the dryer. Avoid using harsh detergents as they can damage the polyester and spandex material. Iron on a low - heat setting if needed, especially around the turn - down collar to keep it looking sharp. With proper care, these shirts will last you a long time and always keep you looking stylish.