Polish inventor Jack Skopinski created electric off-road rollers with rubber tracks. According to the enthusiast himself, his invention was a response to the growing consumer demand for personal vehicles, which are increasingly used by people, moving from the place of transport stop (metro station, parking for transport, bus stop, etc.) to the place of work or residence. The boots are equipped with electric motors of 350 W and 26 V / 26 Ah Li-ion batteries. This allows you to reach speeds of up to 15 km / h. On a single charge you can drive about 20 km. The speed is controlled by a cable-connected controller. The change of direction is set by the user body. The weight of the rollers equipped with a caterpillar track, thanks to which you can move off-road, is 5 kg.