Continuity mistake: When Andy pushes Jack out of the way when the F.T.L. is malfunctioning he is pushed into 2 stacks of crates, they are seen all falling away from him. The next shot of him he is just falling against the crates and one of them falls on him instead of away from him and the other stack stays where it is.
Continuity mistake: Issac slips and falls on Jack's melted jeep - the shot changes and we see him fall again.
Chosen answer: It's basically just a type of suit that's made for whatever special project they're working on. No different than a lab coat, hazmat suit, fire coat, etc.