One of the best things about mountaineering is being able to wear a balaclava without getting pulled over by the police or kicked in the head by Chuck Norris. When it's time to get your inner ninja on pull on a Gorilla 'clava from Outdoor Research.
The Gorilla goes normal clavas one better with a collection of features: it's Windstopper, it has a nose shield that directs your nasty booger spray away from your shades, a fine mesh covers your mouth, and the face shield is removable via velcro straps on either side.
The Gorilla fits very close because it's not a pull-over; instead it has Velcro on the side to open the face up for putting on and taking off. It's cut lower in front to cover your chin, and higher in back so you'll want a high collar to cover the gappage; if you've got a hood you're all set. The inside is supersoft fleece. All in all, very nice and suitable for extreme conditions where you want no square inch of skin uncovered. Be aware: like all Windstopper headwear it muffles sound a little, and when you rip off the Velcro closure it's pretty loud inside.