When activist Brek Huang's metamutant speed powers manifested, he made the jump from hacking the computers of corrupt corporations to fighting crime as Coldsnap. He even became a member of the Legion of X-Heroes 2099.
Coldsnap is a metamutant who absorbs the ambient kinetic energy around him to boost his speed to superhuman levels (at his top speed he can exceed the the speed of sound). As a result of his kinetic absorption, the temperature in his vicinity plummets below the freezing point as he slows down the molecular motion around him to a near stop. When he runs he leaves behind a freezing contrail that gets colder as he accelerates.