My son runs his 60 time barefoot whenever they allow it. When his travel coach recommended this we thought he was BSing us. Side note, his travel coach is OLD SCHOOL, coached decades at a major D1 University and is a Marine. So, we have done multiple tests and all the kids test fastest barefoot. One teammate consistently runs Low 6.4s. Fall Classic we had some new players with us. All the boys took off their shoes and the new players and parents thought it was outrageous to remove your cleats. We told them to make 1 run w cleats and one barefoot. Best times were barefoot. One player ran his best time ever by .2, and the event was laser timed. He did run both times barefoot. His mother said wow that's awesome, maybe you should have run with your cleats, it may have been faster,,,AY, DIOS MIO!