football helmet 1800s Vintage Leather The story behind the 1st

The vent sliders open half-way and all the way but the slots are pretty narrow with a 4.5 mm opening

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Shell: HIR-TH (High Resistance Thermoplastic Resin) shell construction 2 shell sizes, 4 EPS sizes Shield: XQRS (X-tra Quick Release System) visor mechanism for tool-free removal and replacement of the face shield in seconds Scratch-resistant and anti-fog polycarbonate face shield 100% UV protection 2 shield sizesMicro-opening visor GT 4-1 for helmet sizes XS, SM and MD GT 4 for sizes LG, XL and 2XL Ventilation: Integrated Ventilation System (IVS) was designed and optimized in a wind tunnel 5 front vents (3 at the forehead and 2 on the chin guard) 2 rear extractors vents built into spoiler Interior: Fully removable and washable 3D inner liner and cheek pads Liner and cheek pads are sanitized and made from Dry-Lex fabrics Safety: DOT approved ECE 22.06 certified Helmet profile contoured around the base to reduce the risk of collar bone injuries Double-D ring chin strap

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