Hard hat and welding helmet system uses exclusive pivot mechanism. Low center-of-gravity helps reduce neck strain. Two shade 5 side filters increase peripheral viewing area. No ADF filter. Accepts all 3M™ Speedglas™ Filters 9000 Series. Benefits Pivot mechanism allows helmet to nest over the hard hat Low center-of-gravity improves balance of helmet Ratcheting headband SideWindows ADF not included