U.S. Issue Multicam Shirt. Material content of Rayon/Para-aramid/Nylon Ripstop.Multicam is a single camo pattern designed to help blend in to various environments, seasons and times of the day. This is primarily done by the absorption and reflection of lighting. Since only a very small portion of the human eye recognizes color, the brain does a lot of filling in for the eye. Multicam helps the observer to see the pattern as the background. The MultiCam Shirt is constructed to the same specifications as the ACU shirt. Hook and loop facing is also provided on the upper-sleeve pockets for affixing insignia.