These low-profile earmuffs feature a lightweight design for all-day comfort. Earmuff Noise Reduction Rating – 21 dB. Double-up with Mack’s Earmuffs and Mack's Foam Earplugs (5 pair included and an NRR of 32 dB) for a greater combined Noise Reduction Rating of 34 dB! Adjustable and foldable - Fits kids to adults. Great for shooting sports, worksites, power tools, loud events, etc.