Top: HIGH QUALITY Polyester - High quality polyester allows great flexibility and a perfect fit. The adjustable and elastic fit ensures maximum comfort by reducing excessive pressure and allowing the feet to breathe - goodbye to pressure points. Lining: CAN BE USED ANYWHERE - Ideal laces for everyday life as well as for sports and leisure activities such as fitness, running, triathlon, yoga or hiking. With a length of 120cm. If you are having trouble with the light not turning on, please see the details page to take action. If it still does not work after the operation, please contact customer service for a replacement. Insole Material: SUITABLE FOR EVERYONE - Whether athletic, children, adults, seniors or people with reduced mobility - elastic shoelaces are suitable for everyone and make everyone's life easier!