It's Asian size，please check the detail size on the size chart image.Feature:100% brand new and high quality.Quantity:1 pieceKnitted material， fashion and keep warm with answer the phone in winterSet-in MIC， available for cell phone to transmit the speaking phone to your audio devices directly so that the user can hand free answeringSet-in Li-ion chargeable battery， charge via USB Cable， long stand-by time.3 colors for you:black.gray and redSpecifications:Bluetooth Version: V3.0+EDRFrequency: 2.4026GHz-2.480GHzTransmission distance: 30ft，10m or soLi-ion Battery:3.7V/120mACharging time:2.5 HRSStandby time:60 HrsContinuous working time:about 5HrsSize:Fits for head circumference 56-62cmSpeakers can be taken off so that you can wash the hatMaterial:Woolen yarn Package Content:1PC Warm Bluetooth Smart Hat