A more extreme case of hat hair
. Helmet hair is a condition where a person's cranial
hair appears severly matted
to the point where you can make out the contour
of the their skull
. The hair is usually oily
or soaked in sweat. There is no adverse effects to helmet hair other than general repulsion
by other human beings.
The cure for helmet hair is a highly technical procedure that most people can learn at home. Most medical circles refer to this procedure as "wet, lather, rinse, repeat".
Many studies have been done on the cause of this condition, but the results are inconclusive. However, the condition seems to be related to playing (U.S.)football, hockey, or riding motorcycles.