Mack's  ear plugs are molded with super low-pressure, skinned and tapered foam to provide unmatched comfort and improved hygiene. With a high noise reduction rating (NRR) of 32 decibels, this high performance hearing protection can be used in environments where noise is just a nuisance up to environments with hazardous noise levels. Great for loud concerts, motor sports, sleep, shooting sports, power tools, etc.