ABS,Silicone Imported [2-in-1 Baby Headphones] This adjustable infant headphones noise cancelling for babies 0-36 months has a comfortable elastic headband and a regular headband, which are adjustable to fit babies of different head circumferences to avoid squeezing baby's fontanel [Material & Safety] This ear muffs for babies is made of ABS and silicone which are non-toxic and non-allergenic raw materials, and the inner part of the ear muffs is filled with sound-isolating foam, which can effectively absorb and isolate the noise. Can withstand the wear and tear of daily use while being easy to clean and maintain [Effective Noise Reduction] Infants' hearing is more sensitive than adults, and prolonged exposure to high decibel environments can lead to hearing damage. This BEBOAN newborn ear protection not only protects babies' hearing, but also keeps them comfortable in noisy environments [Precautions for Use] When using baby airplane ear protection, parents should ensure that the earmuffs are worn in the correct position to avoid over-tightening or over-loosening. The earmuffs should be checked regularly for damage or deformation to ensure that they are soundproof [After-sales Service]Our product includes a 2-in-1 baby sound proof headphones and a package box. If you have any questions about our products, please feel free to contact us BEBOAN 2-in-1 Baby Ear Muffs Noise Protection, Gray Noise Cancelling Headphones for Baby, Infant Newborn Ear Protection Headphones for Plane, Baby Girl Boy Sound Proof Headphones