This men's casual long - sleeve turtleneck sweatshirt is super easy to use. Just put it on like you would any regular top and you're ready to go for your daily activities. When it comes to sizing, remember to check the size chart as different suppliers have their own measurements. If it's Asian size, go for a bigger one for a better fit. For maintenance, you can machine - wash it in cold water with similar colors to keep it looking new. Avoid using harsh detergents that might damage the polyester and spandex material. Hang it to dry to prevent shrinking. With proper care, this sweatshirt will be your reliable companion for a long time.