Auto Darkening Lens for Welding: DIN9~13 shade range with UV&IR resistance; automatically increases or lowers the shade of the lens to reduce eye strain when welding. ----PP Shell with Sponge-Lining Forehead: PP shell protects you from weld slag and arc light; resistant to high temp, fire, and corrosion; lining with a sponge on the forehead for more comfortable wearing.
eBay