it protects your ear's from loud sounds such as loud music because if you dont have them you can become deaf quicker!
Ear defenders protect your ears by absorbing the sound and fizzling it out
Well, ear defenders absorbs the sound from going to your ear, if you don't wear ear defenders when your working in loud noises your ear can be damage.
Because you touch yourself at night. Furthermore, you will find the word 'ware', is in fact incorrectly used in this question, I believe you were looking for the word 'wear'.
To protect their ears and hearing from getting damaged by loud noises.