Is this the modular helmet? I have a bombardier, and I think it is manufactured my HJC (not sure). Anyway, if it is like mine it will perform excellently and not need a heat sheild to keep fog off the glasses. Make sure the breath guard is seated properly.
I have a LS Air 3 and have no problems (I don't wear glasses). I have a buddy who wears glasses and he swears buy the moto cross type helmets with the goggles. He never had a problem with it being cold last year but I hear they are a little cool on those -25 rides.
An electric sheild will help to keep the helmet itself clear but will do little/nothing to help with regards to your glasses fogging. Do yourself a favor and get contacts for sledding, its less hassle and much safer.
Worked for me,
Nothing will be better than contacts. I've tried many things, masks, breath deflectors, diff. helmets, and even a snorkel type think, but you just can't beat contacts and an electric shield. My contacts have never fogged.
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