General purpose over the head earmuff. More convenient than ear plugs when the noise is intermittant as they can be taken off and put back on again any number of times. Suitable to provide hearing protection for noise levels of up to 110dbA. Measured in accordance with AS/NZS 1270:2002 they are a class 5 device providing 27db or better noise reduction in 80% of cases when correctly worn. Inner foam and headband cushions provide comfort during extended wear, low clamping force applies minimum pressure while maintaing a tight, snug seal. The head ban can be worn in three positions, over the head, behind the head and under the chin which allows the unit to be worn comfortably with hard hats, respirators and safety glasses.