Noise reduction is excellent across the board. I really put the to the test while standing under a running Rolls Royce AE 3007A jet engine checking for oil leaks with the bottom cowling open! The added benefit of being able to discern normal conversation over the din is truly remarkable. Their small size and light-weight are a definite plus over the bulky "muffs" I had been using. They are also much more comfortable to wear when the temperature soars.

Mike Coleman