WKF stands for World Karate Federation and is the international organization that regulates karate competitions worldwide. WKF competition-approved shin guards are shin guards that meet the WKF's specific rules and requirements for karate competitions. These shin guards have been thoroughly tested and approved to WKF standards to ensure they meet the safety requirements for competition use. If you plan to compete in WKF regulated events, you must use shin guards that are WKF competition approved. It is important to consult the competition rules and verify which specific requirements apply to your competition level and age group.