The Thermosuit is a lightweight undergarment lined with thermoelectric filaments. When attached to any power supply it heats up or cools down and keeps the wearer comfortable in almost any human habitable environment. The power required depends on the conditions, but ranges from 100 to 1,000 watts.
At lower TLs where these are available, they are often used in vehicles that do not rate or cannot provide sufficient temperature control, such as race cars. Heat or cold from the thermosuit is routed to heat sinks, which are either placed on the body somewhere, or attached somewhere where they can receive a cooling or warming air flow.