The reflector heat shield is a sturdy, custom-fitted cover that double-insulates your existing air-cooled hood against the heat your lights generate. With the reflector heat shield, less heat escapes into your room and is instead contained within your hood to be better carried away by your existing air-cooling. This results in a cooler environment, happier plants, and energy savings in the form of increased A/C efficiency. IR blocking and heavy duty wool insulating material, custom fit to your favorite Sunlight Supply reflectors. Reduce your grow room temperature. Maximizes efficiency of your air-cooling by containing heat. Quiets roaring air inside the reflector. Soft, durable and machine washable. Strong two piece construction consisting of a high quality insulating wool liner and radiant barrier fabric. 95% reflective. Professionally made in the USA.