The research project Adaptex investigates the potential of using the shape-changing material Shape Memory Alloy (SMA) in an adaptive sun shading textile for architecture. By incorporating SMA as an actuator into a textile membrane, the permeability of the surface can adapt in response to temperature changes in the immediate environment. The aim is to create a responsive textile system that prevents the interior of a building from overheating, without the need of electricity or external controlling mechanisms. The light and flexible structure allows for applications in new building construction as well as in energetic refurbishment.