Infrared radiation (IR) is a form of non-ionizing radiation, invisible to the naked eye, that produces a gentle warming effect at the surface of the body. Infrared sauna environments use controlled IR energy to create a comfortable thermal experience, commonly associated with relaxation and physical comfort. This type of exposure is non-invasive, does not involve direct contact, and is generally well tolerated when used appropriately, making it a popular option within wellness and relaxation-focused settings.