Spira Footwear

Year: 2006 

International Association of Athletic Federations (IAAF) Rule No. 143 states that shoes “must not be constructed so as to give an athlete an unfair additional assistance, including by the incorporation of any technology which will give the wearer any unfair advantage.” The shoe has blurred the line of acceptable for many years—frankly, we don't get what the big deal is. 

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