Not every infrared sauna works in the same way. Shortwave infrared (IR-A) mainly penetrates the surface of the skin and can feel taxing or uncomfortable at higher temperatures. After 10 minutes, shortwave infrared becomes taxing for the body. Longwave infrared (IR-C), such as with Health Mate, heats the body from the inside out. As a result, your core temperature rises safely and in a controlled manner, without overheating the skin. This makes longwave infrared not only more comfortable, but also therapeutically more effective for the heart, muscles, joints, and recovery.