This is achieved via a small vent at the centre of the ear plugs which allows the pressure built up in the ear to dissipate slowly over time

If interested in a product with full Bluetooth functionality

Automatic 15-dB protection when hearing is at risk

part number AC-EB

uvex aXess one

3M™ Peltor Skull Screws Uncorded Earplugs (SLC80 26dB, Class 5) AMFMRadio-False This is achieved via aMetallic look appeals to young workers and drives compliance. Screw grip and twist ensure tight seal and maximum protection. Grab stem and push until snug No contact with dirty hands, greatly increasing reusability SLC80 26dB, Class 5 Uncorded Patented triple flange design gives the most comfortable fit of any reusable plug Conforms to oval shape of ear Washable, promotes worker hygiene No rolling or touching plug portion during insertion