Expert of smells Dr Martin Kleban explains that when the trainers are subjected to pressure or moved, tiny microcapsules break and release their scent.
Real leather smell
Leather things such as, jackets and sofas could also get the treatment.
The clever technique was invented by a German company. Their customers wanted the real smell of leather, which has been lost in modern processing.
The question is which smell would you choose for your trainers? Strawberry or maybe even chocolate!
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Quiz: Are you clued up on sporty footware?
