Designed with the Glastonbury Festival in mind, where attendees are known to slog through mud and grass from stage to stage of the music festival over the pond, the Orange Power Wellies take the kinetic energy produced by human locomotion, store it up and then allow for charging "via a process known as the 'Seebeck' effect." Details below.
The power collected in the 'power generating sole' is collected via a process known as the 'Seebeck' effect. Inside the power generating sole there are thermoelectric modules constructed of pairs of p-type and n-type semiconductor materials forming a thermocouple. These thermocouples are connected electrically forming an array of multiple thermocouples (thermopile). They are then sandwiched between two thin ceramic wafers. When the heat from the foot is applied on the top side of the ceramic wafer and cold is applied on the opposite side, from the cold of the ground, electricity is generated.
Runners and hikers like ourselves would love to see something like this offered in more sporting-active footwear, especially since we're usually wired up with some type of battery powered music device, not to mention power-mobile phone users on the go.