By Mariko Katsumura Mariko Katsumura - Thu Nov 6, 3:45 am ET
TOKYO (Reuters Life!) - A snazzy sneaker with asymmetric soles is sweeping Japan, casting a spell on millions of youngsters with the catchy boast of helping them run faster.
The "Syunsoku" brand of sneakers has sold over 10 million pairs since being launched in 2003, with sales more than doubling every year.
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