Heely skate shoes

I saw a kid with a pair of these on just gliding across the sidewalk. I had to look twice before I figured it out.

Heelys are trainers with built-in wheels that allow wearers to glide across the ground as if floating on a cushion of air.

They have one wheel in the heel, or two for beginners, which are engaged by lifting the toes to tilt the heel back.

The correct technique for "heeling" is to keep one foot directly behind the other during the slide, which can reach 10mph.

To disengage the wheels, users drag the heel down or run forward.

UK importer Heelys Dealers has struggled to keep up with the demand for the shoes, which is expected to top 250,000 this year.