A Royal King Tiger Design is Based of Tiger Personality from Hot Muggs Wild Focus Tiger Collection. A glass beer mug is a traditional drinking vessel used to enjoy a cold beer. It is typically made of thick, clear glass and has a handle for easy drinking. The mug is designed to keep the beer cold and to enhance the flavor of the beer. It is a popular choice for beer lovers and is often used in pubs and bars. The mug is also a great way to show off the color and clarity of the beer.