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The effectiveness of hearing protectors is measured in dB (decibels) using the OSHA NRR (Noise Reduction Rating). Every 10 dB means the physical (measured) sound intensity is reduced to 1/10, however to human ears the loudness feels reduced only to 1/2. The link at the bottom of this article has more details. Many hearing protectors have ratings of between 20 (feels reduced to 1/4) and 30 dB (feels reduced to 1/ Cool

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Disposable and Reusable Ear Plugs for Musicians, Swimming [link widoczny dla zalogowanych], Sleeping, Shooting etc
Choosing ear plugs can be surprisingly complicated as the various materials have very different performance characteristics. Popular brands include Hearos, Flents [link widoczny dla zalogowanych], Howard Leight (Max), Quies and Moldex.
Electronic shutoff or "active volume" amplified ear muffs are designed for shooters. Microphones outside the ear muffs pick up sound that is played back through speakers in the ear muffs. When a gunshot or other loud sound is heard, the speakers automatically switch off, turning the ear muffs into standard passive hearing protectors.
Advantages
Disadvantages
Ear muffs look like headphones. They cost from $10 to over $50. Popular brands include Peltor (Ultimate 10) and Howard Leight (Bilsom).
Harder to clean.Can be uncomfortably warm, especially in hot climates.Relatively big. Not easy to carry around in a bag every day. Some are foldable.Relatively heavy. Can be tiring to wear after a few hours.Can interfere with rifle holds (cheek weld).Not discreet, draws attention. Unsuitable for some situations such as the office.
Read on
How Tinnitus Is Treated
Swimmers Ear
Easy to put on and take off. Especially good for children.Can be worn over ear phones (ear buds) for listening to music.
Disposable ear plugs (sponge, soft silicone, soft wax) cost less than a dollar (most can be cleaned and used a few times). Reusable ear plugs (plastic, rubber, silicone) cost a few dollars.
Ear Muffs for Children, Sports, Target Shooting [link widoczny dla zalogowanych], Hunting etc