are material that use their precise shape, geometry, size, orientation and arrangement can affect the waves of light or sound in an unconventional manner. These properties can allow the material to bend light and sound. Making these great for the creation of stealth suits. More advance materials can even be used as a laser defense.
Photo chromatic material can also be used as a laser defense. The material reversibly change its chemical structure in response to electromagnetic radiation allowing it to absorbed the wave length of light of the laser. While a strong enough laser can defeat such material it is much cheaper to buy and not illegal to own like meta materials are.