Block noise across all frequencies when you choose Air Flow Control™ technology. Dielectric plastic construction provides greater protection in high-voltage, high-current environments. Dual-headband design ensures a secure, uniform-pressure fit regardless of head size. Super-soft comfort-enhancing cup cushions feature a slide-and-lock design, making replacement a snap. Material(s): Plastic; Ear Cushion Material: Foam; Noise Reduction Rate (NRR): 30 dB.