The auto-darkening feature automatically adjusts the lens shade to protect your eyes from harmful UV and IR rays emitted during welding. This helps to prevent eye strain and fatigue, allowing you to work more comfortably and efficiently. The helmet also features an adjustable headband for a secure and comfortable fit, as well as a lightweight and durable design for long-lasting use. With the Titanium auto darkening welding helmet, you can work with confidence and safety on all your welding projects.