Noise Reduction Ability: noise cancelling ear plugs have an NRR of 33 dB and should help to reduce noise from snoring, flying, or other background sounds Ergonomic Design: With the skin-friendly flexible silicone material and ergonomically designed shape, these earplugs should be both comfortable and functional for many user. They can cover into ears without inserting them into your ear canal deeply, so that they will avoid the risk of hearing lossing. The earhook wings will hook on your ear auricle tight, especially if you are a side sleeper. There are to different sizes in one set,S and L Washable & Reusable: These earplugs are washable and reusable so that you dont have to replace them night after night. Simply clean them or clean them with soap and warm water between uses Various Usage Occasions: These noise reduction ear plugs can protect your hearing from loud noise. They are best for or sleepping, workadults or kids swimming, for Noise Cancelling, Sound Blocking Sleeping, Concert Ple Note: sound blocking earplugs can block some noise to a acceptable volume, but not totally silent. Ple feel free to contact us if you have any question