Using these men's long sleeve shirts is easy. Just put them on like any other shirt and you're ready to go. They're great for casual hang - outs, whether you're staying at home or going out. When it comes to washing, you can use a gentle cycle in the washing machine. Use mild detergent to keep the colors bright and the fabric soft. Avoid using bleach as it may damage the material. After washing, it's best to hang them to dry. As for sizing, make sure to check the size chart before buying, as different suppliers may have different sizing standards. If you're in between sizes, it's usually better to go for the larger size for a more comfortable fit. With proper care, these shirts will last you a long time and keep looking stylish.