Noise reduction - Loop quiet plugs are reusable and durable, hearing protection made of soft silicone. They reduce noise and help you enter your bubble. They have a noise reduction of 27 decibels and come in 6 modern colors. Optimal Comfort - These noise reducing plugs come in 4 different sizes, to always find the perfect adjustment. The iconic circular form of quiet loop fits perfect in your ear, making it a modern accessory that protects your audition. They are great for sleeping and can help you focus or concentrate while you study, work or read. And of course, they are a necessity when traveling or moving.