The double layer cup consists of two layers of material, typically glass or stainless steel, with an air gap between them. This innovative design offers several advantages over single-layer cups. One of the most significant benefits is insulation. The air-filled space between the two layers acts as a thermal barrier, keeping beverages hot or cold for longer periods. For instance, a cup filled with hot coffee will retain its warmth, allowing you to savor each sip without the risk of burning your fingers on the outer surface. Conversely, iced drinks will remain cool without causing condensation to form on the exterior, eliminating the need for coasters and preventing moisture rings on your furniture.