MACK'S® Original Soft Foam Earplugs are made with super soft foam and are perfect for extended wear in situations where comfort is paramount. Great for Sleeping, Studying, Shop noises, Work, Travel. With a noise reduction rating (NRR) of 29 decibels, Mack's Original Soft Foam can be used in environments where noise is just a nuisance up to environments with hazardous noise levels. For sleep, study, work, shooting sports, travel, power tools, loud events, etc. Keychain carrying case included.