Product Description Designed for durability and comfort The 3M™ PELTOR™ Optime™ Earmuffs feature a range of models for increasing hearing protection needs. The stainless-steel headband is designed to help keep Over-the-Head earmuffs in place. This product is designed to help prevent bending and warping.  Custom options These earmuffs come in Over-the-Head and Hard Hat Attached models — as well as different bright colors — so supervisors and jobsite managers can verify compliance. To meet the requirements of diverse industrial jobs, these earmuffs feature a variety of NRR options.  Compatible with 3M™ E-A-Rfit™ Dual-Ear Validation System E-A-Rfit™ provides an accurate quantitative assessment of how much noise reduction a hearing protector provides to an individual worker. Choose from different options 3M ID: 70071517059 H9P3E Hard Hat Attached Electrically-Insulated: No  NRR: 23 dB* 3M ID: XH001651278 H9A Over-the-Head Electrically-Insulated: No NRR: 25 dB*