Passive hearing protection, Light and durable construction, Unique spring design, SNR 30 dB, Helmet mounted, Approved and suitable for use with the PureLite and PF3000 Powered Air Purifying Respirators (PAPRs), SNR 30 dB, H 34dB, M 28dB, L 20dB, SLC80 26 dB, Class 5, NRR 23dB, EN 352-3:2020,