I could not find one big enough for my large noggin and mafia-like neck, so I had the GF make me one couple years ago out of Polar Fleece. About $2 bucks worth will make one, and I had her make a big flap on the front that I can tuck into my jacket like a bib. I also wear it snowmobiling, it's great. Also keeps the collars of jackets from grinding away at your neck when turning your head.
Never do anything you would be uncomfortable explaining to the paramedics...