Acoustic Isolation System: Passive Noise Reduction In-the-Ear Stereo Headphones-model:SolitudeAIS The Solitude AIS includes replacement tips that provide a hygienic solution for multiple uses The Solitude AIS tip expands very slowly if foam is at room temperature when squeezed When the tip in your ear has warmed up, it will expand to maintain a good seal i n your ear canal Utilizes patented technology and state of the art miniaturization processes currently in use by the Achieves average noise reduction of 42 dB while the desired signal is boosted -5 to 10 dB at higher