The production process for Litebase starts much the same as the formulation sequence for the other soles in Vibram's lineup, which includes outsoles made from compression-molded rubber for everything from ice to sand to mountain trails. First, they combine the ingredients. “We like to describe it as baking a cake,” says David Filar, a technical product manager for Vibram. After they’ve mixed the different substances together, the rubber eventually takes the shape of what’s called a pre-form, which, Filar says, is a “partially cured” piece of rubber. Then, it needs to be molded into its final shape.