StopFlats 2 Tube Protection Tire Liner LavenderStopFlats Tube Protection Tire Liner is the best protection against flats. STOP Flats2 is a remarkable tire liner made of durable, lightweight polyurethane. When inserted between the bike tire and tube, it provides a protective layer between road hazards and the inner tube. Thorns or glass that may penetrate the tire are blocked from the inner tube. Comes in many sizes to fit your tire.811157017304