Sungate ThermL glass by Vitro is a low-emissivity coating engineered for use on the interior surface of a typical one-inch insulating glass unit that reduces heat transfer and dramatically improves U-values when paired with a Solarban solar control low-e glass by Vitro on the second surface. Due to its colorless and low reflective aesthetic, Sungate ThermL glass enhances U-value but does not change the visual characteristics of the IGU.