Invisibility cloak was developed

America has developed the invisibility cloak. The US army asked Canada camouflage company to make one.

They ordered some options. First, the cloak must be lighter than 450g when it contains battery. Also it must keep the stealth ability during 8 hours. 

The camouflage is important to soldiers. So they wants more ability about stealth. They wants to be invisibility to detectors such as infrared detector.

The principle of cloak is meta material.