Assuming you would like an answer specific to Toyota ventilated seats:
Toyota offers ventilated seats on select models, including the Avalon, Camry, Corolla, Highlander, Mirai, Prius Prime, Sienna, and Yaris Hatchback. The feature is not available on all trims for each model. For example, it is only available on the Avalon XLE and Limited trims; the Camry LE and SE trims; the Corolla XSE trim; and the Highlander LE Plus and Platinum trims.
Ventilated seats work by circulating air through perforations in the seat upholstery. The feature can be turned on or off as desired, and is controlled via buttons on the center console. Some models also offer heated rear seats.
The main purpose of ventilated seats is to provide a cool sensation for drivers and passengers during hot weather conditions. They can also help to reduce sweat build-up during extended periods of driving.