Great for beer. Double wall vacuum insulated. Keeps both hot and cold drinks at the ideal temperature for longer periods, though the cup lid is designed with a wide mouth for convenient drinking. Double vacuum insulating layer ensures no condensation on the outer wall. No coaster is needed. Keeps drinks cold while the outer wall stays warm. Safe to touch when holding hot drinks. Equipped with a metal bottle opener removable from the cup lid to make life easier when you need to open bottled drinks, whether you are at home, the workplace, or outdoors. Made of 18/8 food grade stainless steel. Resistant to corrosion.