3M Speedglas 9100X that's been with me since college all the way through my redseal/journeyman career of 7 years. So far it's out lasted every other welding helmet that's come thru my welding shop : r/BuyItForLife
Speedglas Welding Protection for Personal Safety | 3M United States
Speedglas Welding Protection for Personal Safety | 3M United States