Thermofoil kitchen cabinets are molded out of medium-density fiberboard (MDF). This style door is then wrapped in a type of plastic coating and baked under intense heat to be sealed. The process leads to a durable and cost-effective kind of kitchen cabinetry. Usually mass-produced, thermofoil cabinets only come in solid colors and are imitation wood. However, these cabinets are also inexpensive.