Perfect Design:Double walled mugs design- Made of heat and condensation-resistant borosilicate glass,Accept the temperature from -20C to 150"C.Thanks to the high quality workmanship and experience of the glassblowers, the glass is wonderfully light, clear and smooth for easy and pleasant use.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.After-sales guarantee: 2x400ml Double-walled glasses mugs, provides an 18-month warranty on the product since the date of purchase. You can ask for free replacement, if the product has any quality problems during the warranty period.