There are four main types of sauna. Each developed differently and requiring different technology and use:
Traditional Finnish Sauna
This is probably to most common sauna, and can be found in gyms, spas and health clubs. This version of a sauna is most similar to the traditional roots and is lined with wooden pannels. Inside the sauna there are heated rocks and wooden benches, and offers humidity of 20%-40%.
Unlike other saunas, in an infrared sauna, there is 0% humidity. An infrared sauna instead heats up the body’s internal temperature through infrared heat and light.
A dry sauna is most similar to a traditional Finnish sauna, in that it contains heated rocks. However, the humidity is much lower, therefore offering a moderately dry heat.
A steam bath sauna possesses lower temperatures of around 50 degrees Celcius. However, sometimes these saunas feel more intense than traditional saunas due to their 100% humidity. Instead of wood, steam baths are paneled with acrylic, glass or tiling.