[Mike Pearson]

Most dive shops sell defog for scuba masks. It should also work for glasses. I wear glasses but have not had problems with fogging. I wear an open faced helmet though. Believe it of not your own saliva is an excellent defog. Thats what i use on my scuba mask and it keps my mask clear. Spit on your lenses, rub it around on the lense then rinse and dry. This is an old diver trick. Give it a try!!!