The Laces You've Been Looking For. 

™The Flexon™ lace is a lightweight, low-friction, and performance-oriented flat tubular lace made with buttery soft nylon and engineered to flex with your natural stride. Designed with active rebound using our proprietary non-elastic formulation and production method, it provides just the right amount of recovery to prevent uncomfortable binding in the shoe and promote better circulation for endurance activity and training.