Perfect Design:Double walled mugs design- Made of heat and condensation-resistant borosilicate glass,Accept the temperature from -20C to 150C. Safe to use: Because your hands will stay protected from hot beverages. The mugs are insulated without worrying that your hands will burn with heat or freeze from the cold. Suitable for all locations:It makes the liquid inside seem to float. enjoy an infused tea, rich coffee, ice cold beer and drinks, for a uniquely trendy experience. Perfect for any cafe, restaurant, pub, office or your own home. Perfect Gift: Borosilicate glass mugs is the material you want when dealing with any glassware for best results Makes a fabulous gift for holidays, Christmas, housewarmings, or just for a coffee lover.