The HercuGlass process strengthens glassware in the same way for Fighter Aircraft windshields. Depending on the glass design and thickness, our glassware can withstand bangs, drops on the floor, etc. They are not unbreakable, but they are the strongest glass products you can buy and will withstand abuse that would cause similar glassware to fracture.
These mugs are made for Cold Drinks - particularly beer. Made by Libbey in the USA and strengthened by the HercuGlass® process at Santanoni Glass. A great gift for a Dad that might be a little clumsy - these glasses will withstand a drop on the floor from up to 5 ft (or even more)