Phonak Serenity Choice Motorsport reusable earplugs are designed to reduce helmet-generated noise and can also help to reduce wind and air turbulence noise or engine noise. These earplugs also prevent hearing damage during dyno runs or at motor sport events such as; NASCAR, F1, rallying, motorcycling, jet and F1 boats. Noise levels in motorcycle helmet at 100 kmh are around 95-105dB, which is above the safety limit of 85dB. The earplugs reduce background noise to safe levels enabling you to focus on the road and allowing speech to be heard from intercom speakers. The earplugs provide an open air passage to the ear keeping the ears ventilated at all times and minimising occlusion effect. The product is designed to fit into the ear without catching the helmet liner and is also washable. The earplugs include hypoallergenic ear tips that are made from medical grade TPE. The product is available in small(5-10mm), medium(6-11mm) and large size(7-12mm) and includes 1 year warranty.