Comfortable limited sound reduction
They definitely take the edge off out of loud theme park rides and concerts.  You can still hear a clear range tones through them, which I like and are perfect to maintain sound while not loosing hearing.  They stay in my ears very well but every ear is shaped different so results may vary on this point and come with a variety of sized tips.  I would not use these to reduce sound while sleeping.  They don't reduce to silence and a significant amount of noise still gets in.  The images look like they are flexible but they are not, the hard plastic would probably hurt if you were a side sleeper and try to wear them at night.  For the purpose I bought them for they are great.
Rating: 4 stars