Thanks for bring up the Sock Racer and Trainer. I'd completely forgotten about them. I would have assumed they (Nike) brought that idea out of the mothballs for the Nike Free- which isn't a bad shoe for 3-4 mile runs on soft surfaces. Good God, in high school I was light enough and fast enough to do 6-8 mile runs in the old yellow sock racers! Now I can't go further than 4 in Nike Frees. Pretty f$%king sad!