rounding the Speed line up to the road is strategically placed XT-900 Rubber that provides just the right amount of grip, without sacrificing a lighter underfoot feel. The outsole rubber is spot on, not too much, not too little. With the minimalist outsole rubber approach I would absolutely take this shoe out for a half marathon or full marathon race; maybe not a peak race, but a race nonetheless. In fact, the YouTube full review has “affordable marathon racing shoe” in the title for that midsole ride and strategic outsole rubber. Also, the width of the outsole increased, creating a more stable ride for your running adventures.