I'm going to make an outdoor track soon and was trying to think of a good material. I know about the Ozite and Uz-ite carpets but I can't seem to find them anywhere. I was thinking of maybe getting some carpet like this

http://www.yourautotrim.com/80wideozite.html

But then I would have to take it inside after I'm done using it. That's not really a big deal, but if I do that then I will have to have barriers that can be removed so that I can just take iff the barriers, roll up the carpet and bring it inside. Maybe use pieces of insulation foam for barriers with velcro on the bottom? That way I could take the barriers off. Anyone have any suggestions?