Kind reminder: There is a 2-3cm error in manually measured data. The specific size is subject to the actual product received. Each display screen has different brightness and slight color differences. Please do not mind. If you mind, please do not place an order. There may be some loose threads, so cutting it off will not affect its use. If you mind, please do not place an order. Thank you！！！！！ Size:55-60cm/21.65-23.62''(Head Circumference)