Make of high borosilicate glass with inner and outer layers for effective insulation, this glass prevents burns when handling hot beverages like tea or coffee, perfect for both offices and home use Withstands extreme temperatures from 20°C to 130°C without cracking, making it ideal for both hot winter drinks and refreshing beverages year round Perfect as a coffee mug, Espresso mug, or a multitude of other hot and cold beverages Clearly displays double layer construction with visible adhesive points at the base, demonstrating authentic high borosilicate glass for consumer confidence Features a unique design for a secure, nonslip hold