Jake Gyllenhaal
Credit: Elsa / Getty Images

Jake Gyllenhaal, seen at a Brooklyn Nets game here, is growing his hair out for an upcoming film called EverestBased on the true story of a mountaineering disaster, Gyllenhaal plays extreme climbing guide Scott Fischer who died scaling the mountain in 1996. Like Fischer, Gyllenhaal is growing out the classic outdoorsman's long hair-and-beard pairing. If you're doing the same, consider keeping your hair tied back like Gyllenhaal to balance things out. There is such a thing as too much scruff.