Noise Cancellation - Earplugs are durable, reusable soft silicone hearing protectors. They reduce most noise and help you penetrate the foam. They have a noise reduction rating (SNR) of 27 decibels. 3 pairs of ear tips, sizes S, M and L. MULTI-PURPOSE - The ear plugs are versatile and provide protection against noise and background noise in many situations . They are great for sleeping and can help you focus while studying, working or reading. Of course, they are essential for traveling or commuting. EASY TO USE - These headphones are easy to insert and do not protrude from your ears when worn correctly. If the earbuds do not reduce the sound enough or fall off, it is better to try a larger size earbud.