“…Flexible sensors that can respond to external stimuli such as strain, pressure, and temperature have received widespread attention because of their potential applications in wearable devices, medical monitoring, flexible robots, and smart prostheses. − Humidity, as an important index in the atmosphere, is very important for the industry, agriculture, and the daily life of humans. − The daily actions of the human body, such as sweating and respiration, lead to changes in the humidity of the surrounding environment. ,, Wearable devices can be used to obtain physiological and psychological information about the human body in a noninvasive manner by monitoring changes in sweating and breathing in real time. ,, Moreover, a humidity sensor has noncontact sensing characteristics that make it an important supplement to contact flexible sensors. , Therefore, endowing flexible sensors with humidity detection capabilities has attracted much attention from researchers. Till date, multifunctional flexible sensors with humidity–strain, humidity–temperature, and humidity–pressure detection capabilities have been reported. ,,, …”