This article argues against mandatory helmet laws for cyclists. While helmets are effective at preventing head injuries for children, laws requiring all cyclists to wear helmets can have unintended negative consequences. Countries with mandatory helmet laws have seen fewer cyclists on the roads and less time spent cycling. However, cities like Amsterdam that have invested in bike lanes and encouraged a cycling culture have very high rates of cycling without mandatory helmet laws and few cycling injuries. The article concludes that Canadians should not be burdened by mandatory helmet laws that have little safety benefit and may discourage cycling.