Looks kinda suspect, doesn't it? People in comments on those videos saying Greg split up with Ally or whatever her name was and is now spending a ton of time with this Eric guy. "Fruity" type remarks.
If it is a toupee, it's time to consult Mike O'Wig for the right advices. I watched this guy before that wears them and says about the sweaty dome when working out. I couldn't take that shit. Don't even like my back wet when doing cardio with t-shirt on. Imagine sweat on your dome you can't even wipe off. Wtf. I'd rather go shaved head