The resin can be photo-crosslinked to form a dual-crosslinked network consisting of both covalent and reversible crosslinks. By controlling the ratio of covalent and reversible crosslinks, we create elastomers with unprecedented combinations of softness and stretchability (E, 20-143 kPa; 𝜖 𝑓 , 510-1350%). Using a customized SLA printing platform, we demonstrate printing this resin to produce high-resolution 3D structures with extreme dissipative properties. Further, we develop a setup to show that the printed structures can protect brain-like soft gels from impact damage.