ez-TRAK is the world’s first double mechanism fastening product introduced by YKK Corporation in the “next generation” product series called “YKK i-Series”. The “ez-TRAK”, the brand new double mechanism fastener with vertical and horizontal insertion has been designed based on human engineering to express the simplicity and easiness of both tracking and opening/closing of a zipper. The combination in a puller of simple and ergonomic design and high quality represent the new concept of fastening by YKK: “ez-TRAK”.