Buy this two pack and save . This Amazing Helmet Darkens the Instant You Start Welding. It Adjusts from #7 to #13, & clears to a shade #4, the auto-darkening lens never needs batteries, charges with exposure to welding or sunlight. Extra wide viewing area for better performance, padded ratcheting headgear & light weight composite body reduces user fatigue. Exceeds ANSI Z87 Standards, Protects user from UV & IR Radiation, Darkens in 1/10,000 of a second and best of all, it's shade adjustment control is inside the helmet where it won't accidentally get knocked out of adjustment, that means no surprises.