Gruppo Bertone is an Italian automobile company, which has specialized in car styling, coachbuilding and manufacturing. Bertone styling is distinctive, with most cars having a strong "family resemblance" even if badged by different manufacturers. Bertone has styled cars for Abarth, Alfa Romeo, Citroën, Ferrari, Fiat, Iso Rivolta, Lancia, Lamborghini, Mercedes Benz, Opel and Volvo Cars among others. In addition the Bertone studio were responsible for two of the later designs of the Lambretta Italian motorscooter. In the late 1980s, Bertone styled the K20 motorcycle helmet for Swiss bicycle and motorcycle helmet manufacturer Kiwi.