Musician plugs are a custom moulded solution designed to prevent hearing loss. They are made by hearing professionals and require a specialised ear impression to be taken.
They have a much longer lifespan than either the ETY or foam plugs. Typically they replicate the natural response of the ear but at a softer and safer level.
When these plugs are used, the musician will find the sound to be clear but not harmful. On stage, musician plugs provide good clarity and actually help to hear rather than hinder, especially when using foldback speakers, as it removes the distorted sound that is often produced.