If you're looking for excellent noise attenuation from an ultra-lightweight pair of muffs, raise the QM24+ ear defenders to the top of your list. Convenient multi-position headband allows you to wear your protection the way you like: behind-the-head, over-the-head or under-the-chin. Dielectric plastic construction accommodates electrical environments. Soft, comfortable can cushions may be easily cleaned and, if necessary, replaced. Material(s): Plastic; Ear Cushion Material: Foam; Noise Reduction Rate (NRR): 25 dB.