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ChubbyBoyA balaclava will work well with your helmet and have no effect on the fit, a beanie on the other hand is a little more subjective. If you have the opportunity to go into a shop with your helmet and goggles then just try on different beanies.
gogglegapslazerYou could look for one with a puffball on it because it adds to the safety and has the added advantage of not allowing the helmet to sit properly on your head :)