We have tested the Flexi-Felt covers for noise reduction capabilities by using a Decibel meter to be able to measure our chair leg cover's effectiveness in a classroom. We simply measured the noise generated by a classroom of children getting up at recess and then made the same measurements after the Flexi-Felt covers were installed. We repeated the same tests again. But this time we measured the sound difference from the room under the classroom. This is something many teachers and principals at schools of two-story buildings can appreciate since you are not only subjected to noises of your own classroom but also of the one above. On average the Flexi-Felt reduced the noise of a 25-student classroom by over 15 decibels!This is the difference between the noise of a large diesel truck and a small car cruising along. Studies have shown that children learn best in a silent environment. The teachers will also appreciate not having to raise their voices over the chair movement noise. They are also referred by many hearing associations as a product of choice with regard to noise reduction. It is critical for people with hearing problems to have as little background noise as possible in order to hear what is being said.