It might seem counterintuitive, but short can look better for thinning hair; Adding texture through a choppier cut and by using the right styling products. There are a couple of ways to do that:
Hairstyles for short thin hair 2012
Mens hairstyles for thin hair 2013
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40 Stylish Hairstyles for Men with Thin Hair
Web from short haircuts like the buzz cut and crew cut to long styles like the comb over, men with fine hair have a number of cuts and styles to choose from.