The HP-25 ear muffs are simple, lightweight and comfortable. Musicians, craftsmen and other professionals appreciate the straightforward hearing protection. They’re also proven effective in helping children with autism eliminate distracting outside noise. Features: Passive Attenuation: 33.4 dB Safety: Completely dielectric Weight: 7 oz Universal padded, fully adjustable headband Foldable for storage Environmentally responsible natural passive isolation – no batteries required