"Lack of freedom in the toes, shoes slipping, and laces coming undone" - these issues directly lead to a decline in athletic performance. Magic Laces mitigate these problems and unlock the natural power of your feet by adjusting the elasticity of the laces to suit different areas of the foot. Simply thread Magic Laces through your shoes, and they will naturally arrange themselves with the tension needed for exercise. Available in two sizes: 105cm (for 4-5 eyelets) and 120cm (for 6-7 eyelets)."