Professional earmuffs from Kask. This top-of-the-line hearing protector has a uniquely sleek design which offers a small outside profile but large interior cavity for superior fit. Recessed upper cup will fit all Kask Super Plasma and Zenith helmets. Liquid/foam filled cushions provide optimum seal against head for reduced contact pressure. Meets CSA class A standards. These earmuffs have a noise reduction rating of 22 decibels (NRR 22 dB).