These range from yellow plugs inserted into the ear to customised otoplastics. Each type of hearing protection has specific qualities.
Visitors to factories or construction sites are often given such ear protection. They are cheap. The disadvantage of these is that they can irritate the ear. When these are inserted into the ear with dirty fingers, there is a risk of external ear infections. Use once only.
These completely seal off the hearing so you get the sensation of being closed off from the outside world. They are cheap, but slightly more expensive than (yellow) foam earplugs. Use once only.
Available in various models. They can also be clicked onto a safety helmet, for example. There are also special earmuffs for children who wish to learn in a focused manner, for instance. The earmuffs cover the ear completely. Depending on the material used, the earmuffs can irritate around the ears, particularly in warm weather.
These resemble the (yellow) foam pluggs but are made from a less irritating material. You only cover the auditory canal with these earplugs, you may not insert them into your ear. There is also the chance that they fall off the ear. Use once only.
Now the most popular earplugs. These completely seal off the auditory canal, but the layer system prevents a sense of being shut off from the outside world.
The filter system enables users to determine the muffling themselves. Alpine Hearing Protection is the inventor of this system. The various types of universal earplugs can be seen here.
Customised hearing protection. Motorcyclists and musicians often use customised otoplastics. This type of hearing protection fits perfectly and can last for years. Alpine Hearing Protection supplies otoplastics with various muffler values.