What material did Claes Oldernburg use in the giant burger?

Claes Oldenburg created his giant burger using soft vinyl and other materials that allowed for a playful and exaggerated representation of the hamburger. This choice of materials gives the sculpture a whimsical, tactile quality, emphasizing the surreal nature of his work. Oldenburg is known for transforming everyday objects into large-scale art pieces, and the burger is a prime example of his approach to pop culture and consumerism.