Mack’s Slim Fit Earplugs offer the same great protection as our standard sized earplugs, but are designed with a slightly smaller diameter, providing comfort to those with smaller ear canals. Molded with super low-pressure, skinned and tapered foam to provide unmatched comfort and improved hygiene. Slim Fit carries a noise reduction rating (NRR) of 29 decibels protecting your hearing during sleep, study, work, shooting sports, travel, power tools, loud events, etc. Mack’s premium aluminum travel case is included for on-the-go convenience. Attach to your keys or backpack so you never get caught without your Mack’s Ear Plugs again! The case holds one pair of Mack’s earplugs and the screw on cap with rubber seal helps keep the earplugs clean and protected.