Protection against very high noise level and loud sounds. Using Omnifit reflective headband, light weight, and limited contact pressure for all-day comfort. Cups are 360в„ѓ rotating anti-scratch and its height is adjustable. Attenuation: H=38dB, M=34dB, L=36dB. Signal-to-noise ratio : 36dB. Standards: CE Approved / EN 352-1