The 3M Peltor X4 Ear Defenders are designed to offer protection against high noise levels, whilst maintaining a sleek, low profile, aesthetically pleasing design. The 3M Peltor X4 Ear Defenders can attenuate sound by as much as 32dB whilst maintaining a sleek, low profile, aesthetically pleasing design. Extremely slim and light-weight cups help to improve compatibility when used with other Personal Protective Equipment. New specially formulated damping pads and innovative foam contained in the sealing ring provide excellent acoustic protection, particularly against sounds dominated by low frequencies. Simple colour coding: bright green, indicating high attenuation combined with an extremely slim, lightweight design. Attenuation: Helmet Attachment: SNR = 32dB, High Frequency = 36dB, Medium Frequency = 30dB, Low Frequency = 21dB.