Here’s an educational and entertaining video from Safe Kids Canada that illustrates a good helmet fit: http://www.youtube.com/watch?v=Ak6tmRqjE68&feature=plcp

Ensure your children wear a helmet every time they ride.Get the right kind of helmet. Choose a bicycle helmet for cycling, in-line skating and scootering. Ensure the helmet fits your child. The helmet should rest two finger widths above the eyebrow. The side and chin straps should be snug. People of all ages should wear a helmet when they ride. Remember: You are your child’s best role model.