It prevents chapping. It won't affect the sweat.

It helps prevent some cold effects like chapping and frostnip. If it's cold enough and windy enough, it will not prevent frostbite. I've never been convinced that it's an insulator. That's where face masks help - subzero F or 50mph winds. But I prefer the freedom of running without a mask if conditions permit. I'll use vaseline on my feet also.

If your face is sweating, you obviously don't need vaseline since it's not cold enough.

I tend to use it if I'm going out for a couple hours or more at 20F and even short runs if below 0F. Even if it doesn't prevent anything, it does feel more comfortable than going without.

I use it when it's quite cold out (below -16c). I find my face feels less frozen and less affected by wind. I believe it's a layer of protection between your skin & the cold air.

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quote:<HR>Originally posted by mum2girls:
AK - would you please tell me more about using vaseline on your feet? <HR>

I just rub it on my feet (AFTER taping if needed for other reasons). I was originally introduced to that method as a way of dealing with wet feet. It doesn't work that long for that, but it does tend to keep my feet from drying out as much in cold, dry air. At least for awhile. If I'm going to be out in windy (say 30+mph) or cold conditions (10F or colder) for awhile (couple hours or more), I'll use either neoprene socks or sealskinz over liner sock over vaseline over my feet.