“The running shoe right now is doing nothing for preventing injuries,” said Reed Ferber, director of the Running Injury Clinic at the University of Calgary’s Faculty of Kinesiology. But, he adds, going barefoot has downsides too, and the research so far is still inconclusive. “It’s a total tradeoff.”

Chris McDougall, author of the recent book Born to Run, goes further. “If this were a drug, it would be yanked off the market,” he said of running shoes. McDougall says his own persistent problems with plantar fasciitis cleared up after he started running in Vibram FiveFingers.