Originally Posted by skye

Let's first take a look at what other things you are doing to actually prevent winter falls, rather than something you imagine might help after the fall. During the winter, do you:

1. change tires to ones more appropriate for the season?
2. slow your speed to that appropriate for the poorer riding conditions
3. increase your visibility to aid idiot motorists in spotting you during reduced visibility/reduced light conditions
4. Wear appropriate clothing -- in particular, balaclava, ski goggles, etc.

Let's get *those* safety items cleared up first. Then you can more appropriately consider whether a full-face helmet is necessary.