Questions about making a foam rubber costume

[VaderArmor]

I used to own a Hirogen costume from Voyager, it looked like it was made of some foam material and it was painted.
I want to make a Borg, does anyone know what type of material this is? and where I can get it?
I want to make a life size borg but not borgs from TNG series, the borgs seen in first contact and voyager are foam type suits and this is the look I'm after. Any help?

 

[the_batdemon]

More than likely, it was (hot )foam latex. Try Monster Makers.

There are newer materials that give similar results that don't require an oven to cure.