Here comes a different kind of hot-stepper: A pair of Wellington boots that convert heat from your feet into electricity. The kicker? You can store up enough juice to charge a cellphone, so you can yak it up without missing a beat. The Power Wellies are the result of a collaboration between Orange , a British telecommunciations company, and the renewable-energy gurus at Gotwind . A prototype made its debut today at England’s Glastonbury Festival , where Orange is the official communications sponsor.