Used to describe anything that, through the application of science so advanced it may as well be magic, exhibits seemingly impossible behaviors or properties. The key is that the behavior/property on exhibit only -seems- impossible; if the observer had an understanding of advanced science, it would make perfect sense. "Made of future" used to be applicable only in speculative fiction, but is increasingly appropriate in the context of the real world.
Usage "Wait...how does the thin fabric of a guard uniform stop a knife blade?" "Dude, the uniform is made of future". Note: actually, it's made of Kevlar fibers saturated with non-Newtonian goo that locks the fibers in place under sudden impacts, but "made of future" is simpler.