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From Fellrnr.com, Running tips
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== Stage Three - Traction? ==
The next stage may well be to add some extra traction for running trails or on ice. [http://www.skyrunner.com/screwshoe.htm http://www.skyrunner.com/screwshoe.htm]. However, talking to folks who have done this, the results are mixed at best.
==See Also==
Modified Nike Frees - http://hhollines.blogspot.com/2010/06/zero-drop-nike-free-30-review.html
