Not legal for Boston

First launched in August 2024, with only 1,000 pairs available worldwide, the Puma Fast-RB Nitro Elite almost made the Adidas Pro Evo 1 look like child's play. The difference, however, was that this speedster wasn't race legal

https://www.runnersworld.com/uk/gear/shoes/a61946515/puma-fast-rb-nitro-elite/