3M 1445 Optime III Headband Ear Muff Defenders High Noise Level Reduction 30d B Ref 4540A-411-SV.- Soft & wide sealing rings filled with a unique combination of foam & liquid, providing optimum sealing & low pressure.- Extremely low profile & light, making it easy to team with other equipment.- Unique band design, stainless steel wire for constant pressure over long periods of use.- High attenuation despite lightness & low profile.- Generous inside depth to accommodate the ears for comfort.- For moderate to high noise attenuation.- SNR 30d B.- Optime III headband ear defenders.