The Kramer brothers sold tunnels for toy train layouts as part of their Life-Like line. The original supplier was making the tunnels from papier mache, but was unable to deliver on a consistent basis. At the same time, they learned about a German manufacturing process to mold expanded polystyrene foam into shapes that could later be painted and decorated. They imported the technology and began making tunnels out of the polystyrene foam. According to son Jay Kramer, workers at the factory discovered the insulating properties of the foam tunnels could be used to keep their lunches hot or cold. Soon after, the company began producing foam ice chest coolers under the Lifoam name in 1954.