What is the thermal insulation of mugs?

The thermal insulation of mugs refers to their ability to retain heat or keep beverages cold, typically achieved through materials like ceramic, glass, stainless steel, or plastic. Insulated mugs often feature double-walled construction, which creates an air gap that minimizes heat transfer. This design helps maintain the temperature of hot or cold drinks for extended periods, making them popular for both home and travel use. Additionally, some mugs incorporate vacuum insulation for enhanced performance.