The main function of the infrared sauna is to make you perspire. Sweating is a good thing because it helps to flush unwanted and harmful toxins out of your body. Infrared saunas promote a deeper sweat in more profuse amounts than you get from a traditional sauna.
The advantage is that you will flush away a greater number of toxins than you would in an ordinary sauna. Infrared saunas are also easier for most people to tolerate because they operate at a much lower heat than traditional saunas. 15 to 20 minute sessions are usually recommended but a lot of people are able to comfortably remain in the sauna for longer periods.