Thermacool’s patented phase change technology offers intelligent temperature management for the inside of most every trailer we carry. This breakthrough in science and engineering utilizes phase change materials (PCMs) that go from solid to liquid and back again to absorb or release heat, which helps maintain a consistent temperature inside the enclosed trailer. Older trailer designs utilized simple aluminum skins with little to no insulating material, causing the inside to become a veritable oven in hot temps. The Thermacool liners, along with smart vent placements, helps to keep precious cargo from being subjected to temperature extremes.