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Designed specifically for very high noise levels, the powerful HPE muff/cap models are ideal for airfields, power plants and other areas with intense noise. They provide the highest rated protection available for low frequency environments. A padded headband and super soft ear cushions ensure all-day comfort and protection. HPE-Cap (helmet mount) features: low pressure spring design for added comfort with easy to adjust cups for three distinct wearing positions.Weight: 8.9 oz.. (Cap model NRR 27 is for medium Vgard caps only.)