Wing suit flying is “the art of flying the human body through the air using a special jumpsuit that shapes the human body into an airfoil which can create lift.” Video after the break.
The wingsuit flier wears parachute equipment designed for skydiving or BASE jumping. The flier will deploy the parachute at a planned altitude and unzip the arm wings, if necessary, so they can reach up to the control toggles and fly to a normal parachute landing.
[via Wiki]