Shoes that tell you in which direction to walks have been tested by low cost airline easyJet. They are connected by Bluetooth to the satnav in your smart phone, which sends them a signal triggering a sensor in the appropriate shoe, which vibrates when you need to turn left or right. All users need to do is tap in their destination before setting off. easyJet says this latest example of wearable technology would allow sightseers to walk to museums or other attractions without the inconvenience of having to look at maps or even consult their phones. The airline calls the shoes "Sneakairs". It says it has already tried them outing Barcelona and could eventually be developed for passengers to buy on board.