Ear moulds:

An earmold is a device worn inserted into the ear for sound conduction or ear protection.

some users specify how hard or soft they want their mould to be, an audiologist can also suggest this.

As a conductor, it improves sound transmission to  eardrums. This is an essential feature to diminish feedback paths in hearing aids and assure better intelligibility in noisy-environment communication. The main goal in wearing earmolds is to attain better user comfort and efficiency. 

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