Kids' Earmuffs - Blue These can be used as noise-reducing earmuffs, and by extending the core bar for size adjustment, they can comfortably fit those with a head circumference up to 56cm, including adult women. They can be used in various situations, such as for those with auditory hypersensitivity, for on-site work, for those who want to escape from noise, or for those who want to concentrate quietly. These earmuffs can be used with confidence as noise reduction earmuffs by a wide range of people, from teens and up. *A head circumference of 56cm is the average head circumference for women. Those with a larger head circumference are not applicable, so please measure the user's head circumference before purchasing. An average NRR (Noise Reduction Rating) of -27dB effectively reduces noise, does not disturb children's sleep, and protects their hearing. It efficiently reduces the sound level in the high-frequency noise band. The noise-reducing earmuffs use high-density sponge, which has sound absorption and noise reduction properties, effectively reducing noise decibels. The ear pads are made of high-quality ABS material, resistant to heat and low temperatures, and resistant to breakage and deformation, demonstrating excellent noise-canceling ability. Low-resilience material is also used in the headband, protecting the head and providing comfort. These noise-canceling earmuffs can be used by a wide range of people, including infants, children, babies, teens, and those with a head circumference up to 56cm. Noise canceling creates a quiet environment and improves children's learning and reading efficiency. #Earmuffs #SoundproofEarmuffs #EarMuffs #NoiseReduction #AuditoryHypersensitivity