The holes in the back of the Pro TurboSpeed are part of the zoned aerodynamic details to reduce drag. They're pretty sexy, too.
According to Carmelita, the suit is so tight that "it feels like you're running with no clothes on." Carmelita also explained that even though the suit hugs the skin, it's surprisingly easy to put on. The inside of the suit is smooth and "feels like baby powder." Carmelita also emphasized the comfort of the suit; it creates no distractions.