- THERMOS vacuum insulation technology for maximum temperature retention - Turns most standard 16 and 20 oz coffee shop cups into an insulated travel tumbler - Fits most automobile holders - Durable stainless steel interior and exterior - Silicone grip keeps cup in place - Keeps beverages hot 3X longer than a plain paper cup - Cool to touch exterior with hot liquids inside - Durable for everyday use, just insert coffee cup and go