Three-layer noise reduction: Due to the three-layer noise reduction structure of the noise canceling earplugs, the noise reduction effect can reach 30d. This therefore reduces harmful decibel levels. Ergonomic Structure: Noise canceling earplugs allow you to have a comfortable user experience. Its anatomical shape allows it to fit perfectly inside your ear and rest on the outer ear. Waterproof material: Sleep earplugs have a long lifespan because they are made of waterproof and durable silica gel that will stand the test of time. Easy to use: silica gel earplugs. Swimming only needs one step, and you can easily take it into the water for sports. It also has a handy storage box, so you can take it with you at all times. Wide range of use: the waterproof earplugs form children's and adults' ears. adults, and can go deep into the ears due to their good shape and flexibility, which fit the ears perfectly.