Personally, I would say a messy type hair style is good for guys with thinning hair. Using light hair styling products are good, some could even help add volume, but remember to go easy on them.... hence the phrase "less is more." What I actually did was go to a salon to get a haircut and told the guy, "do what you think is the best for me," I didn't give him any direction. He did the greatest job in giving me a new hair cut and style. Taught me the best way to style my hair and what products work good.