Description :  Adjustable Sleep Headset Earmuffs Hearing Noise Protection Ear Defenders Safety   Features :  Soft and comfortable、 have a good sound insulation. Provides 21dB protection. Foam filled cushion on earcups provide comfortable wear. Adjustable elastic headband fits virtually all sizes. Great for factories、 aircraft、 battlefield and so on. When you are at home、 traveling、 riding bike、 learning、 etc、 you can be protected from noise interference.   Specification :  Material: ABS (Acrylonitrile Butadiene Styrene) Size: Approx. 20x8x20.5cm\/ 7.87x3.15x8.07!#!amp!*!quot;   Package includeds :  1 x Earmuff   Details pictures :