I have a question about the clear sticker on the bottom of one of the shoes, I tried to peel it off and I think it's been there a while. The red underneath is lighter than the rest of the shoe. Should I just leave it on or deal with a lighter patch of red. I think I'll get some vibram placed on the bottom to spruce them up! I've also got to get some heel pads for the back because they're a little loose. Does anyone have any idea how old these might be? Thanks!