Many double-walled glass mugs are made from borosilicate glass, known for its resistance to thermal shock and its overall durability. Unlike traditional glass, borosilicate glass can withstand high temperatures, making it safe for hot liquids. Additionally, they are often dishwasher and microwave safe, allowing for hassle-free cleaning and reheating. This durability contributes to their longevity, ensuring that you can enjoy your double-walled glass mug for years without fear of chipping or cracking.