Bespin is a major source of tibanna gas, a fictional material which is refined for production and transport in Cloud City and used in hyperdrive coolant for starships, as well as in the production of firearms. It is home to several million individuals, including humans and Ugnaughts.
The planet is a gas giant that is about 73,000 miles (117,000 km) in diameter. Like most gas giants, it has a solid core that consists of metal followed by layers of metallic gases. Many of the layers of gas are poisonous, and the pressure and temperature are far above what a human could tolerate. But from approximately 93 to 112 mi (150 to 180 km) down from outer space, there is a habitable layer known as the Bespin Life Zone. This layer has an oxygenatmosphere with the temperature and pressure that makes it ideal for human life. It is in this layer that Cloud City is located.