Underwater Wearable Sensors Underwater wearable sensing is of great significance for improving the safety and efficiency of underwater activities. In article number 2211758, Peng Xiao, Tao Chen, and Junjie Wei review the representative design strategies for developing water-resistant conductive gels and their diversified applications in the underwater sensing field as wearable sensors, which provides guidance for promoting the rapid development of gel-based underwater wearable sensors.