PartyPlug hearing protectors are made of special AlpineThermoShape material. This material adapts to the shape of the ears so that you always have the perfect level of noise attenuation. They are also very comfortable to wear. There is no sense of isolation or external pressure on your ears. AlpineThermoShape is hypoallergenic. This means you will not experience itching in or around your ears, as is often the case with silicone earplugs: you can wear Alpine PartyPlugs the entire night.