Deluxe muffs stand up to high-noise environments: airport runways, construction sites, weapons-testing fields, etc. Liquid- and foam-filled ear cups significantly attenuate both low and high frequencies. Padded headband adjusts to provide a slop-free fit. Assembly is color-coded for compliance sighting. Material(s): Metal; Plastic; Ear Cushion Material: Liquid/Foam; Noise Reduction Rate (NRR): 27 dB; Ear Muff Style: Over-The-Head.