Advanced lacing system for athletes2Speed Laces iBungees flex with the motion of your foot for plush comfort. Includes cord locks for instant adjustment and a secure hold. Turns any shoe into a slip on. Never tie laces again. Adjust instantlycustomize your perfect fit. Deliver consistent comfort to your feet by continually adapting to the changing forces and presses of the stride. Unique system dramatically minimizes discomfort, fatigue, and risk of injury. Patented system assures lace tension is always equal throughout the shoe. Great for sensitive feet. Includes extra strong cord locks for a secure hold and instant adjustment. Easy installation instructions included.