Like all protective gear, ear plugs need to be kept in good condition and periodically replaced. Over time, the material wears down, becoming less effective at blocking out noise.  This can put riders at risk of permanent hearing damage caused by loud engine noise. To ensure their ears stay safe, motorcyclists must pay attention to when their ear plugs start to wear out. A good rule of thumb is to replace ear plugs every four months or so, depending on how often they are used. Signs that they need replacing include losing the ability to block out sound or feeling uncomfortable after long rides. Keeping a few extra pairs on-hand is also a smart move for emergencies.