A Better Fit that You Never Have to Tie Again... Yankz! Sure Lace System is the most comfortable and innovative lacing system available. The unique design is ideal for walking, running, hiking, gym class, biking and other athletic activities. Expandable cords provide an unsurpassed level of "personalized" fit and comfort. No more tying, retying, double knots or frazzled dirty laces. Slip on your shoe with Yankz! You're ready for action!