These helmet mounted earmuffs are designed to fit and install on all types of safety helmets without the need for an adapter. The inner sides of these cups have a large space for the comfort and convenience required in your every working day. They have a high-density cushion for a good sealing designed to mitigate noise and to provide more comfort to the user. With this helmet mounted earmuffs, you will mitigate noise in works related to industry or machinery, protecting the ear canal.