He wears a high altitude helmet in some scenes. Similar to an S-1030 helmet.Looks like his suit has a pressure collar in some scenes.
Clear so you can see the actors face, just like space helmets with lights shining on their face.
It's a new model of helmet. I don't know the exact model but I think it's the current USN/USMC issue flight helmet but painted over in a glossy color scheme resembling the one from the first movie.
actually on quick glance - the new helmet just looks like a HGU 55 with the visor stops on the top of the helmet removed.