Unstable Molecules

Unstable molecules are a piece of fictional technology featured in Marvel Comics. They exist as a configuration of unknown atomic nuclei and electrons that are responsive to certain energized matter around them. Developed by Reed Richards (Mister Fantastic of the Fantastic Four), unstable molecules are typically utilized in fabrics for superhero or supervillain costumes, allowing the fabric to conform with the wearer's form and to not succumb to the wearer's powers. For example, as Mr. Fantastic stretches, his costume stretches with him instead of tearing. The same goes for his teammates: the Invisible Woman's costume becomes invisible when she does and the Human Torch's costume doesn't burn when he activates his powers. Essentially, it acts as an extension of the wearer's skin.