Dashiell "Dash" Robert Parr. Dash is a speedster. On Incredibles merchandise, he is called the "Fastest Kid on Earth". While he is only as strong as the average 10-year-old boy, the film's official website lists "enhanced durability" amongst Dash's powers, which is implied in the film by the amount of incidental high-speed collisions and crashes Dash endures without apparent injury. Dash also discovers throughout the course of the movie that his speed allows him to be able to run over water without submerging.
Dash would like to go out for sports, but his mother Helen will not allow it because she thinks that he would show off his superspeed and blow the family's civilian cover. To vent his frustration, Dash uses his power to play pranks on his teacher, Bernie Kropp, which also threatens their cover.
Dash's reckless and impulsive nature and one-track mind have put him at odds with Violet's gloomier and more sarcastic nature more often than their parents would like, but when Dash is in battle, he cares deeply about his family; he was willing to attack a fully grown man who was about to kill his sister with an assault rifle.
His super suit is designed to be resistant to air friction, wear and heat when Dash is running at super speed.