These things are awesome. Fits under a helmet or cap/hat. When getting to warm can just be pulled down around neck. The draw string ones are especially great. A pair of glasses or goggles and your whole face is covered. About the best stay warm thing aside from boots, gloves and coat. Cheap too.
Amazon.com: 5585 POLAR FLEECE ADJUSTABLE BALACLAVA - BLACK: Clothing
Keeps all the body warmth in.