Podiatric surgeon Dr. Jacqueline Sutera explains why flip-flops aren't sensible footwear ... You don't fit well into your shoes, you'll start having pain when you walk, and it'll also start ...

It is one of the simplest shoes on the planet ... Yet Brazil's Havaianas brand took the humble flip-flop to new heights. The company behind them was sold earlier this week for $1bn (£780m).