Without a doubt, the single WORST design ever by NIKE. If you have ever worn these shoes, they tear at your heel without mercy. You literally rip up your leg with this stupidly designed "spoiler" that should be banned from production. I thought they had fixed it, but I actually had to CUT mine to wear them. Terrible design, dumb, grey wears off very easily and just a piss-poor designed shoe. Never buying anything like this from NIKE again. Who does the testing on their products?