How to use: Wear this shirt directly for light welding work or layer it under other clothing. It's suitable for various welding environments. Notice: Make sure to check the shirt for any damages before each use. If there are any signs of wear or tear, replace it immediately. Maintenance: You can wash it at home up to 50 times or send it for commercial washing up to 25 times. Follow the normal washing instructions for cotton clothes. After washing, dry it in a well - ventilated area.