Noise reduction: Made from polyurethane acoustic foam with density microbubble holes, these ear plugs attenuate sound as it passes through and reduce noise by 37dB. Comfortable to wear: A slow rebound design adapts to the complex structure of the ear canal, providing quietness and comfort during use. Hygienic and packaged: Each pair has an antifouling surface treatment and is individually packaged for cleanliness and convenience. How to wear: Use a clean hand to roll the ear plug thinly. With the other hand, lift the of the ear, then insert the rolled ear plug into the ear canal. Hold in place for about 30 seconds until the plug springs back completely. Typical uses: For sleeping to block ambient noise such as snoring or street traffic; for travel on planes, trains, or buses to reduce cabin noise; for studying or working in noisy environments to improve focus and concentration.