M1 Premium earmuff. Good looks and style, exclusive iridescent colour and sleek, curvy shape for a look that workers will want to wear. The SoftCoat® covering on the cups and yoke helps to muffle transmitted noise. Unique metal band design, it features a black-chrome, spring-steel headband that resists fatigue and is more durable. It maintains stability and doesn't twist out of shape like other wire-band earmuffs. Six different adjustment points provide a custom and comfortable fit for most head sizes. The M1 folds into a super-compact size for easy storage. 100% PVC-Free®. NRR 29. M1 premium earmuff folds for easy storage. M1 has a black-chrome, spring-steel band that doesn't twist out of shape like wire bands.