Materials and construction, External vertical distance, Internal vertical distance, Internal vertical space, Horizontal Distance, Height of use, Harness, cradle, Sweat band, Chin strap, Ventilation, Accesories, Impact absortion, Resistance to penetration, Pre-conditioning low Tª, Pre-conditioning high Tª, Pre-conditioning water inmersion, Pre-conditioning artificial ageing, Resistance to flame, and Chinstrap Anchoring. According to EN 397. pH According to ISO 3071
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