The SKUSA SuperNationals is a multi-class sprint karting championship. The series fields five classes across junior and senior categories, with KA100 Senior and Pro X30 forming the strongest divisions and junior classes in both formulas competing at a more modest level. The current roster is predominantly ungraded club-level drivers, with a small cohort of Silver-graded competitors drawn from professional sportscar and endurance racing. The field sits between the semi-professional ranks and genuine club racing. Drivers arrive from higher-tier single-seater and sports-car series as well as stepping down from established professional championships; most who leave the SuperNationals move to IMSA WeatherTech or the SCCA club racing structure, though some progress to top-level endurance racing with WEC.