Formula Winter Series is for F4 cars with a Tatuus T421 chassis and Abarth engine, and uses Pirelli tyres and TM Brakes. The series is held on some of the best tracks in Portugal and Spain, boasting a strong class of the best European single-seater teams. For Hitech, Formula Winter Series provides the perfect preparation for first year British F4 drivers, aiding their transition from karting to their first full season of single-seater racing.