Pressure sensors are crucial in many emerging applications, but traditional designs are often bulky or inflexible. In a recent study, researchers from Japan developed a fiber-shaped pressure sensor that overcomes this limitation by increasing—rather than decreasing—its resistance when compressed. Owing to a unique multi-walled conductive core made from graphene nanoplatelets, these fibers could enable fine-tuned tactile sensing for next-generation smart textiles and robotic grippers.