I have kept this in a dark place since I purchased it. Immediate purchase is OK. ■Size (cm) Head circumference: Approximately 40 / Width: 9 ■Material Pile fabric ※ Please do not give this to infants or small children under any circumstances, as there is a risk of unexpected accidents. ※ Applying excessive force may cause damage. ※ Please refrain from using this for purposes other than its intended use.