Posted By Zyggy Turek A lot depends on your Noise Level survey and your specific industry. The survey should not only tell you the noise levels you have, but also the relative frequencies involved, and from this you can work out what level of noise attenuation you require, i.e. the standard of ear defender which will reduce the noise level down to at least 90dBA & below. Ear plugs (& there are many varieties) generally tend to have higher levels of protection, but many find them uncomfortable and if you work in a dirty environment, there is always the chance of introducing an infection into the ear canal. A further disadvantage is that all sound can be blocked out which may cause other safety issues such as communication or hearing alarms, vehicles, etc. Don't get me wrong, there are many industries where ear plugs are ideal, so it's really down to "horses for courses" & a proper Noise Survey.