How to use: Put on the helmet and adjust the Ergo Fit system using one hand by turning the dial until it fits your head comfortably. Make sure the helmet sits level on your head. Note: Always wear the helmet when cycling. Do not modify the helmet on your own as it may affect its safety performance. Maintenance: Wipe the helmet with a soft, damp cloth regularly. Remove the removable visor and clean it separately if needed. Store the helmet in a cool, dry place away from direct sunlight and sharp objects.