The Optrel Helix 2.5 ADF welding helmet and hard hat features an internally mounted slide up ADF with a non-reactive shade level of just 2.5, giving welders a brighter and clearer view of the workpiece and their surroundings. The unique Optrel Helix slide up concept, allows the welder to choose the protection required for each application with a single turn. Complete welding tasks with the auto darkening filter down, and proceed to grinding and sanding by sliding the ADF up inside the helmet, revealing a totally clear visor with 180° viewing area. Optrel Helix 2.5 ADF Welding Helmet & Hard Hat 2.5/5-12