Just had the following advertisement sent to me by my daughter-in-law who is Japanese. Prada are manufacturing a shoe (currently only available in Japan) with a clear space to insert talc in the soles.

As pressure is applied minute specs of talc are released through the heel. Apparently its like dancing on air.

I contacted the press office in the UK but couldn't get much info. They did send me a little diagram though.

Only to be worn on April 1st