Ear Muffs - Green In addition to being used as noise-reducing ear muffs, the core bar can be extended and adjusted to fit head circumferences up to 56 cm, allowing even adult women to use them comfortably. Shipping: Sagawa Express, etc. Uses vary, including for those with hyperacusis, on-site work, those who want to escape from noise, or those who want to concentrate quietly. These ear muffs can be used with confidence as noise reduction ear muffs by a wide range of people, from teens and up. *A head circumference of 56 cm 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 hearing. It efficiently reduces the sound level of high-frequency and other noise bands. The noise-reducing ear muffs use high-density sponge, which has sound absorption and noise reduction properties, and can effectively reduce noise decibels. The ear pads are made of high-quality ABS material, which is resistant to heat and low temperatures, and is resistant to damage and deformation, demonstrating its noise-canceling ability to the fullest. Low-resilience material is also used in the headband to protect the head and provide comfort. These noise-canceling ear muffs can be used by a wide range of people, including infants, children, babies, teens, and those with a head circumference up to 56 cm. Noise canceling creates a quiet environment and improves children's learning and reading efficiency. #EarMuffs #SoundproofEarMuffs #EarMuffs #NoiseReduction #Hyperacusis