3M™ PELTOR™ Optime™ I Headphones H510B-403-GU Features Soft wide cushions help reduce pressure around the ears and increase comfort and wearability. The wide internal space of the headphones helps reduce moisture and heat buildup. Easily replaceable ear pads and spare parts help maintain the headphones hygienically. The wide internal space of the headphones helps reduce moisture and heat buildup. Soft wide cushions help reduce pressure around the ears and increase comfort and wearability. 3M™ PELTOR™ Optime™ I earplugs offer versatile protection for both short and long-term tasks. Ideal for protecting against noise from a variety of sources in the workplace and during recreational activities.