The only earplug specifically developed in response to the recent update to NFPA 70E. One of the most commonly overlooked sections of this new standard is the requirement for use of hearing protection in Category 2 and higher potential arc conditions. High level noises such as an arc blast cannot only damage a person's hearing, but can cause concussive disorientation. The new E-A-R ARC Plug utilizes our patented Hear-Through™ filter technology to offer an earplug that allows the wearer to hear sounds clearly around them (i.e. Conversation, traffic, radio, etc.), while receiving protection instantly in the case of an impulse noise (i.e. Arc blast). A second side (red) of the new ARC Plug offers protection against constant high-level noise. NRR: 22 dB UOM: 10 Pr/Bx