"Upper: 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 operation, please contact customer service for a replacement.Sole 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.Warm prompt again:After installing the battery cover, remove the insulating strip, tap the product on a table surface with a little force a few times to fully charge the battery with the product. With it, he can work normally.Three flash modes.Instructions.1. Attach the spike to your shoe.2. Put the ends of your tip from the hole under the driver.3. Insert the tip ends into the holes on the side and turn the switch to the "Lock" position.4. Press the center button to get a pair of awesome flashing shoe toes for your party."