According to legend Spring Heeled Jack only appears at night abducting people, though he abducts women most of the time.
He is a feared demon who causes the disapearance of many; It's unknown what happens to his victims.
Spring Heeled Jack is said to look like a mustached gentleman wearing a suit, shoes, tie, gloves, top hat, and a monicle.
Spring Heeled Jack is said to jump very high and that he can leap through great distaces which gives him the appearance of flight.
(hence the name Spring Heeled Jack)
It is believed that he has super jumping abilities, others claim that his shoes have springs.
It is also belived that salt is his weakness, it is said that salt can turn him into stone.
In the legend, water can restore Jack from being a stone statue.