H540P3E 3M Peltor Optime III Helmet Attachment The 3M Peltor Optime Earmuff range offers very versatile protection covering all noise levels. The wide comfortable sealing rings are filled with a unique combination of fluid and foam, which gives optimum sealing and low contact pressure, ensuring the best possible comfort even during long periods of use. With the cushioned metal headband you can ensure constant pressure and consistent protection. For use with the following helmets: JSP MK7, MK8 & EVOLITE, PROTECTOR HC300EL, HC710, and MSA V-GARD, SUPERV-GARD II.