Most of these guys shoes look pretty minimal to me. But maybe only 4-5 oz flats, not 3.1 oz flats. If nothing else, with all the turns and leg fatigue, you need a little more stability that a ultra minimal shoe can provide. These guys are so effective with the mechanics, I don;t see how cushioning on a 29-34 minute run is of any concern. If anyhing, they'd be concerned that too soft, without good rebound characteristics will steel some stored energy and be slower.

http://triathlon.competitor.com/...le-in-chicago_122493

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