It's a 'high density' foam, which moulds itself to the ear canal. The density of the foam, coupled with the snug fit in the ear, limits the volume of sound reaching the eardrum.
you can put head phones in or ear muffs or you could just not the loud sound in the first place
To protect their ears and hearing from getting damaged by loud noises.
Having no hair in your ear canal does not directly impact hearing. Hair in the ear canal helps trap dust and particles, but the actual hearing process occurs in the inner ear where sound waves are converted into electrical signals. Factors like damage to the ear drum or inner ear structures can affect hearing, but hair presence in the ear canal itself does not.
A soft case will protect a camera from being damaged if it were to fall. It can also protect sensitive lenses from scratches.
Earmuffs used for cold temperatures protect your ears, by keeping them warm. Because ears are sticking out from the rest of your body, they are susceptible to being damaged from frost-bite, and in severe cases, could even fall off. Earmuffs used for sound protect your ears from loud noises, that could burst your eardrum and/or make you deaf.
The ear drum.
anything
A sheathing conductor is a conductor surrounded by an insulating material that provides protection from external factors such as moisture, heat, or mechanical damage. It is commonly used in electrical wiring to ensure safety and prevent electrical hazards. The sheath also helps to contain the conductor's electromagnetic fields.
Ear defenders protect your ears by absorbing the sound and fizzling it out
You can damage the tympanic membrane (ear drum).
Loud sound can potentially damage the delicate hair cells in the cochlea of the inner ear, leading to hearing loss and tinnitus (ringing in the ears). Prolonged exposure to loud noise can also cause damage to the ear drum or middle ear structures, affecting overall hearing function. It is important to protect your ears from excessive noise to prevent such damage.