Flowfeet is heated by infrared lights, which emit a red glow through the socks. The heating function is binary and can only be turned on or off; therefore, you cannot choose the specific temperature for your Flowfeet. The temperature during the heating function typically ranges between 45 and 50 degrees Celsius.
It takes approximately 10 minutes for the heat to reach an optimal level. The degree of heat is proportional to the friction generated during the massage, meaning that increased friction results in higher heat.
It's worth noting that the ambient room temperature affects the heating time; in a cooler room, it takes longer for the device to reach full heat compared to an already warm environment.