The Old Fashioned glass, also known as a rocks glass or lowball glass, is a short, wide glass with thick walls designed for drinks served on the rocks. Typically holding 6-10 ounces, this sturdy glass features a wide base and straight sides that taper slightly toward the rim. The thick walls help to insulate the drink, keeping it cold longer, while the wide base provides stability and allows for easy stirring. The glass's design makes it perfect for cocktails that are built directly in the glass, such as the Old Fashioned, and allows plenty of room for ice cubes and garnishes. Its robust construction and timeless design make it a versatile choice for a wide variety of cocktails, from simple highballs to complex mixed drinks.