Cars UK | Citroen C4 Cactus Revealed with Funky Style and Technology Automobile Magazine Most prominent of these is the advent of Citroen's Airbump exterior body panels: bubble-wrap-like air pockets made of thermoplastic polyurethane, attached to the vehicle's sides and bumpers. Available in four colors that add visual and textural ... Citroen C4 Cactus (2014) first official pictures |