Music fans can use their mobiles at festivals this summer without fear of draining the battery - thanks to a new pair of wellies that charge your phone as you dance.
Power Wellies have a power-generating sole that converts heat from your feet into electrical current.
This 'welectricity', as the makers call it, can then be used to charge a mobile phone.
Twelve hours of stomping through the muddy fields of festival sites will give you one hour of phone use.
Dancing gives you even more call time - because the hotter your feet get, the more energy is produced.
They have been created with renewable energy experts GotWind.
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