Flip-flops can impair a driver's control if they come off the foot and lodge under the brake or gas pedal, according to Bill Van Tassel, PhD, the American Automobile Association's manager of driver training operations. "Whatever you wear on your feet, make sure it's not so loose that it pops off and interferes with the pedals," he says.
One last bit of expert advice. If you flip-flop your way through lazy summer days, don't forget: your exposed feet need sunscreen, too.
Otherwise, you could be sporting sunburned tootsies with your sequined flip-flops -- bad for your skin and a disastrous fashion statement, too.