These belts have been approved by the World Karate Federation, also known as the WKF. The WKF is the largest international governing body of Karate and the only one recognized by the International Olympic Committee. It oversees the Karate World Championships and other major competitions. WKF-approved belts are officially certified for WKF competitions and events. They’re available in black, blue, and red color options and in a range of sizes. They’re made by ProForce from cotton or satin materials. They measure 1.75” in width and feature a double-wrap style.