Assuming this is some magic material and you can't duplicate it with a rubber band then you need to get your credit card out and drop $13 for this iPhone case (?). The "Just a Loop" iPhone case is basically some sort of elastic strap that wraps around an iPhone providing some protection for the front and back of the phone. The kit comes with four loops and is available here. Forget about the corners, who needs corners?
Update from Konstantin… “Thank you or the article, however I would like to address one major misunderstanding about Just A Loop. It is NOT elastic. I would very much appreciate if you could check the FAQ section of my website…”
Video after the break.