Has anyone tried heated goggles? I find that when the temperature drops below 0F, I get ice formation on my goggles. All of the heated goggles I have found are aimed at the snow machine crowd, so they are designed to use a 12V high amperage power source. Heated goggles that are designed to be powered from a USB port (yes, I know that means .5A maximum current draw) would be wonderful. Has anyone seen such a thing?