The varying thickness of this material is what determines which wavelengths of light reflect back, and therefore which colors we see — if we see any at all. (discovermagazine.com)
Thickness of material made it able to be worn without Spanx as well. (renttherunway.com)
Here's how it works: When pressure from the outside squishes the two layers together, an electric current is created, running through the thickness of the material. (sciencemag.org)