The Sonis range of ear defenders have been designed by the JSP R&D team. Working with a leading UK acoustic engineering research facility they have developed an ear defender range that peaks at an unbeaten 37 SNR.Features & Benefits:SNR 37High attenuation large cup 112-117dBExtreme industrial noiseAircraftQuarryingPaper millsHeavy engineeringHygienicCustomisationColour Coding for easy selection