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System 4 - Visor Holder: Moulded and specially formulated from a high temperature compound, the System 4 visor holder slips neatly within the earmuff bracket or to a slotted connector. Receptive to any MSA visor, the simple slide in operation firmly fixes the visor in place. To interchange, just "pop-out" one and click in the next.
Bilsom Natural Sound Technology: Traditionally all hearing protectors were made to block out as much sound as possible. Bilsom realised that often it is important to be able to hear sounds in the workplace environment, e.g. fire alarms, reversing buzzers, someone shouting a warning, or to with co-workers. So Bilsom developed NST - Natural communicate Sound Technology, which is a globally patented technology that allows people wearing NST earmuffs or earplugs to recognise more sounds while still enjoying full hearing protection. This development encourages 100% wearing time essential for the effectiveness of any hearing protection.
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