Sentinel™ A50 Revolutionary Shell Design: high impact resistance nylon. Halo™ Headgear: Ergonomic, infinitely-adjustable 5 point head gear provides extreme comfort and balance. Low-profile design, central pivot point allows for maximum head clearance while helmet is in the up position. 3.93” x 2.36” (100 mm x 60 mm) viewing area. 1/1/1/2 –5-13 ADF. Color touch screen control panel with 8 separate memory settings and externally activated shade 4 Grind Button. Hard hat adapter option available for use with ESAB hard hat 070000800 Yes -