Correct answer
An anti-fog system compatible with the visor.
An anti-fog system suitable for that visor. Use compatible products or inserts and follow manufacturer instructions, including daytime or night-time restrictions and light-transmission requirements. Ventilation also helps, but no system guarantees fogging can never occur. Darkening or polarising a visor is not the same as giving it anti-fog protection.
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Only making the visor dark, without an anti-fog system.
Only polarising it, without an anti-fog system.
An anti-fog system compatible with the visor.
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