LoE2 Glass is coated with two microscopically thin metallic layers, which reflect radiant heat while permitting the passage of visible light. In hot climates, LoE2 glass reflects unwanted solar heat, helping to keep your home cooler and reduce cooling costs. LoE2 glass helps keep your home warmer in the winter as well by reflecting radiant heat back into your home. This not only keeps you more comfortable, but helps to reduce heating expenses also. LoE2 glass blocks 84% of ultraviolet rays, which will protect your drapes, furnishings and carpets from fading caused by the sun