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The cardboard sleeve on to-go cups of coffee is called Coffee Condom. Its purpose is to insulate the drinker's hands from hot coffee.

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The unassuming cardboard sleeve snugly wrapped around to-go cups of coffee, playfully dubbed the "Coffee Condom," serves a simple yet essential purpose. Primarily, it acts as a barrier, protecting the coffee drinker's hands from the scorching heat of freshly brewed coffee. This clever invention is not only a testament to thoughtful design but also underscores how everyday convenience is enhanced through small but significant innovations.

Origins of these cardboard sleeves can be traced back to the 1990s, a period that witnessed a substantial rise in the popularity of take-out hot beverages. As consumers increasingly opted for on-the-go coffee options, the need for a solution to the discomfort caused by holding hot cups became evident. The introduction of the coffee sleeve provided a quick, efficient, and cost-effective solution to this problem, allowing coffee enthusiasts to enjoy their favorite hot beverage without the hassle of heat discomfort.

The design of the coffee sleeve is ingeniously simple: a piece of corrugated cardboard that wraps around the cup. The corrugation increases the insulating properties of the cardboard, trapping air and slowing down the heat transfer from the cup to the hand. This design not only protects the user but also provides additional grip, reducing the risk of spills which are particularly likely when holding a slick, condensation-covered cup.

From an environmental perspective, the rise of the coffee sleeve has prompted discussions about waste and sustainability. In response, reusable coffee sleeves have gained popularity among environmentally-conscious consumers. Made from a variety of materials such as silicone, fabric, or neoprene, these reusable alternatives provide the same benefits as their disposable counterparts but can be used repeatedly, reducing waste.

In conclusion, the coffee sleeve or "Coffee Condom" is a prime example of how a simple innovation can address a widespread need, improving the everyday experience of coffee drinkers worldwide. As the coffee culture continues to evolve, it is likely that the coffee sleeve will remain a staple accessory in our daily routines, symbolizing the blend of practicality and pleasure that defines the modern coffee-drinking experience.