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 very visible in you want to wear it at a
   music club.
- No helmet pressure issues as it sits flush with the entrance of the ear.
- Opening in the plug lets air pass and reduces "stuffy" feeling compared to foam plugs.
- Reduces pressure change ear discomfort associated with airplane takeoffs and landings. More comfortable than EarPlanes brand as it does not protrude from the ear, letting you lay your head on the pillow.