I've got a question for all of you other parents who have young kids that want to go along on the trail rides. I have a 2-1/2 and 4 year old that will be heading out for their first family rides this year, and I am wondering what is the best way to go as far as helmets. Should we go with a MX style helmet or go with a regular bicycle style helmet. I know that the MX style helmet will provide better protection, but I am worried about the extra weight on their neck if the trail is bumpy (which they usually are). Any sugguestions would be appreciated...