On May 1st, 2013 a new law takes effect in Manitoba that mandates the use of bicycle helmets for cyclists under the age of 18. If you are under 18, and not wearing a bike helmet while cycling, or are a parent or guardian of someone under 18 that is not wearing a bike helmet while cycling, you can be ticketed under the Highway Traffic Act.
This law also provides an alternative to paying a fine, for cyclists who have received their first ticket for not wearing a helmet. They can take the Manitoba Bike Helmet Safety Course and have their fine dismissed.
See more info here: