Details from Dakine:
John John Florence sets a high standard on the water. His signature Kainui leash follows suit. Designed for surfing waves in the double overhead range, it features the highest quality 1/4-inch (6.5mm) urethane Dura-Cord with molded ends to keep you connected to your board in big surf. Dakine built its reputation on the surf leash, and everything about this leash is designed with durability, performance and comfort in mind. All John John Florence products feature recycled cardboard packaging with no plastic to help keep our oceans clean for tomorrow.