These are going to make a lot more sense in Desktop and Mobile, because the realism of the Shrink Wrapped plastic relies heavily on Normal and shininess maps. I've included both in a folder below. If you're deriving, keep in mind, that plastic textures on left and right shoes uses the same UV map, but if you're gonna apply any text, you should mirror it on the left foot texture. Otherwise, it's gonna appear flipped on the left foot in Client.

CLICK for UV maps here