This 3M Pro-Grade Hi-Viz Earmuff has a Noise Reduction Rating (NRR) of 27 dB, smart solution for protection against harmful noises Features steel wire headband with rubber overmold design for durability and comfort Lightweight with adjustable design reduces pressure points for all-day comfort Premium cushioning and pivoting cups to help ensure a good fit and flexible headband adjusts to multiple head sizes Vented headband design improves comfort when worn with hats and it helps lower your risk of noise-induced hearing loss Great for use in noisy workshops, factories, construction sites and during landscaping