20 dB filters out damaging noise. Good for continuous type noise you would be exposed to in: motorcycling, music concerts, sporting events, flying, studying concentration in noise. Comfortable to sleep in. Acoustic filter reduces noise but allows speech/music/surrounding sounds to be heard. - Low profile compared to others on the market. Does not stick out of the ear. Not that visible if you want to wear it at a music club. -No helmet pressure issues as it sits flush with the entrance to the ear. -Opening in the plug lets air pass and reduces the "stuffy" feeling compared to foam plugs. -Reduces pressure change ear discomfort associated with airplane takeoffs and landings. More comfortable than EarPlanes brand as it doesn't protrude from the ear, allowing you to lay your head on a pillow.