When you need to be able to hear verbal commands and what's going in your surroundings but still require reliable hearing protection in the field or on the job, the Moldex Battleplugs Impulse Earplug 6498 is the ideal solution. Authorized for U.S. military use, these earplugs feature caps that open up to enable hearing while providing protection from the noise caused by loud blasts. In the open position, the level of protection increases proportionately with the volume of the blast. When the easy-to-use caps are closed, the earplugs provide NRR 24dB protection from ongoing noise. The earplugs come in a convenient carrying case with a ball chain attached for securing the kit to gear.