The area of second most popularity is soft electronics and tough hydrogels have predominantly been used as strain sensors, where a deformation of the material leads to a measurable change in electrical properties. Consequently, their characterization most commonly includes conductivity measurements (often with varying strain of the sample), spanning a conductivity range of 0.3-1.66 • 10 4 S/m. A conductivity of 1.66 • 10 4 S/m was the highest reported value for conductive tough hydrogels and was achieved in a PVA-based composite gel embedded with polyaramid fibers and Ag nanowires. Due to the high conductivity, the materials exhibited high shielding capabilities from electromagnetic interference, which is especially desired in soft robotic applications to avert electric malfunctions. As opposed to other literature-reported strain sensors, their conductivity stayed constant for 500 cycles over a strain range of ε = 10-90%, with the specific need for this strain-independence remaining somewhat unspecified. Tough hydrogels with shape memory properties have the ability to remember their original shape and return to it via an external trigger once they have been deformed. Such materials are of interest for biomedical applications, where they can be implanted in a less invasive deformed state and once put in place are triggered to return to their original shape, performing an intended function. Zhang et al. demonstrated this with their P(AN-stat-AAm) single networks (driven by hydrophobic interactions), which were used for the embolization of porcine renal arteries to counteract aneurysmcaused hemorrhages. The hydrogels were injected via a catheter in an unfolded state and once they reached a temperature of 37 °C coiled up tightly to block the respective artery. Angiographic images showed that the embolization was successful and stable for up to 12 weeks; no recanalization was observed and when removed the hydrogel string was still tightly entangled. The fracture energy of this material (Γ = 16.6 kJ/m 2 ), however, was tenfold that of pig aorta and how this value benefited the hydrogel string was not discussed. Nonetheless, the above example shows nicely how tough hydrogels can be used to replace contemporary devices that are often based on metal alloys.