Concept and mechanism of the sweat-sensitive adaptive warm clothing (source: Science Advances, 2025. DOI: 10.1126/sciadv.adu3472).
A research group at Nanjing University of Aeronautics and Astronautics, led by Xiuqiang Li, has developed an intelligent jacket that dynamically adjusts its thermal insulation through a bacterial cellulose membrane filling responsive to humidity, tells Tech Xplore. This membrane expands to 13 mm thickness in dry, cold conditions to retain warmth, then contracts to around 2 mm in humid conditions—such as when the wearer sweats—to release excess heat.
From an engineering standpoint, the team first created a controlled testing environment using a skin-mimicking system to gauge thermal regulation performance under varied humidity and temperature conditions. Following promising lab results, they integrated the membrane into commercial down-jacket designs and conducted real-world trials—with volunteers walking or cycling outdoors—monitoring comfort, body temperature, and membrane responsiveness.
The results are compelling: compared with traditional textiles, the adaptive jacket demonstrated an 82.8% enhancement in thermal regulation capability and extended the “no-thermal-stress” comfort zone by an average of 7.5 hours across tests in 20 cities. These figures highlight the material’s potential for variable environments and prolonged activity.
Potential applications range widely: outdoor workers—such as couriers, sanitation staff, and police—could benefit from thermal comfort that adapts to physical exertion, reducing risks of overheating in cold climates.
Nevertheless, several challenges remain. The durability of the bacterial cellulose membrane under repetitive compression, flexing, washing, and exposure to extreme weather remains untested. Scalability and cost-efficiency of material production also need to be addressed before commercialization.