Details Suitable for use with all MSA safety helmets.Comfortable for all-day wear with unique injection molded inserts providing excellent attenuation and maximum space for the ears inside the cup. Features a spring design that offers low pressure tension and a high level of comfort.Note: Safety helmet supplied separately.ANSI S3.19-1974 and meet CSA Class A approval. Professional Helmet mounted ear defenders for use in low to medium noise levels. Ultra soft padding for comfort. Dual sound deadening material. Adjustable when on helmet. Spring design offers low-pressure and a high level of comfort Three distinct wearing positions for ease of use Excellent grip makes it easy to adjust the cups, even when wearing gloves MSA SOR10012 EXC Cap Mounted Earmuff Helmet Ear Defenders (SNR 26)