A Tessera Materials variable-stiffness composite using a magnetorheological elastomer core sandwiched between carbon-fiber skins, capable of transitioning from pliable rubber-like flexibility to near-rigid structural hardness in under 80 milliseconds when a magnetic field is applied via embedded coil networks. Rigel-VS panels and sheets can be locally stiffened in zones, allowing complex morphing behaviors — a flat sheet that selectively hardens into a structural brace, or a garment that locks rigid around an impact site. Field collapse returns it to full flexibility instantly.