The Walkstar I FitFlop ($49.95 at Nordstrom.com) might be the hottest footwear of the season—Oprah Winfrey even put the shoe on her list of favorite things for summer. The shoe claims that its patent-pending microwobbleboard midsole technology will help its wearer get a workout while she walks. Is that possible?

Dr. Robin Ross, a podiatrist and president-elect of the New York State Medical Association, has a pair. “They are contoured with a deeper heel cup and an arch so that it feels as though your foot has support,” she explains. “I don’t believe the FitFlop helped me lose weight, though. Just the mere fact of moving burns calories.” orSend to a friend