Skate Canada dictates the following:
Skaters working on STAGE 5 and below, as well as all skaters in PowerSkate programs, MUST wear CSA approved hockey helmets.
Skaters working on STAGE 6 or higher may choose to continue to wear a helmet at their discretion. The skater, parent/guardian have the final say as to whether or not the skater will or will not wear a helmet.
For more information on how a helmet should fit, and FAQs related to this policy, please see Skate Canada's Helmet Use Information page.