"Heed!  Go cry yerself ta sleep on yer giant noggin!"

As a big-headed runner (7 7/8 hat size), I figured that I'd never find a running cap that I could fit on my gargantuan cranium without reducing blood flow to the upper reaches of my brain.  I just found my hat:  the XL version of this cap.  This is the running cap for those of us with big heads.

It's dippy-looking as hell when worn with the neck cape, but it works like a charm.

HIGHLY RECOMMENDED.