Professional noise cancellation technology: 21dB NRR (Noise Reduction Index), double-shell waterproof design offers perfect noise reduction, and provides a quiet environment for you. Special synthetiMaterialsMade of ABS and spongMaterial, comfortable tWear, light to carry and use, specially designed to protect you from electrical hazards and noise. Adjustable headband and foldable design: It is easy to extend or adjust the earmuffSUITABLE for adults or children, convenient to use and store, an earmuff for all limbs. Excellent Safety Earmuffs for Various Use: Ideal for hearing protection and noise reduction when studying, shooting, hunting, mowing, drilling and working in industrial factory, etc. Main characteristics: unfolded height: 22 cm; folded height: 12 cm; cup color: black, green brown (your choice). Product description Color: Black This earmuff is designed to cover a person's ears for hearing protection during shooting practice or industrial factory work. It consists of a headband that fits over the top of the head, and a cup at each end, to cover the outer ears. Earmuffs protect thWearer from extreme noise. The protection comes from an acoustic sponge which absorbs sound waves and reduces the amplitude of the waves. Features: