The Citroën C4 Cactus is a C-segment small family car produced by French automaker Citroën in Spain. The C4 Cactus is considered a C-segment car although it is based on the PSA PF1 platform that underpins the smaller Citroën C3 and DS3. A distinctive design feature is the “Airbump” panels on the car's sides, designed to protect the vehicle from damage in car parks. The Citroën C-Cactus concept presented at the 2007 Frankfurt Motor Show previewed the production version.