Whether you’re barefoot running or running in barefoot running shoes, you’re automatically put on more solid, balanced footing. This is because your feet and ankles rapidly strengthen the more you run barefoot and you gain better stride control too, all of which are directly tied to better pronatory control that results in massive reductions in rotational, tensile and torsional loads on the feet and legs. Another contributing factor to improved pronation control while barefoot running or in barefoot running shoes is it forces you to pick up your feet more quickly which reduces foot-ground-contact time which can sharply limit the time of unwanted foot motions. Read more here about how footwear strongly affects foot pronation during running. 
Barefoot Running Benefits: Overpronation Prevention
