A waterproof and breathable cellulosic composite with thermal management inspired by penguins.

Temperature is paramount for human body, contributing to a growing demand for enhanced thermal comfort in wearable textiles. However, it is still a major challenge to prepare multifunctional thermal comfort materials with integrated insulation strategies. The Antarctic penguin uses its feathers to maintain body temperature by three different functional layers, namely photothermal conversion layer, thermal insulation layer and infrared reflective layer.