WHAT IS UNDER THE HAT ?

This is a tale about my good mate Matt 
In all kinds of weathers he wears a hat 
Nobody knew the colour of his hair 
Was it dark or was he fair ?

Matt of course maybe completely bald 
If that is the case his head never got cold 
I wonder if Matt's hair is curly or straight 
Something I don't know and I'm his mate 

So Matt's hair remains and is a mystery 
Outlined in this poem as you can plainly see