from Ottawa Public Health

Helmets

Bicycle helmets must be worn by all cyclists under the age of 18. Look for the CSA or CPSC certification in the helmet before you buy or wear it.

• To provide maximum protection, the helmet should fit level and square on the head, and the front should cover the forehead.
• It should sit snugly on and not slip when the head is moved around, even before the chin strap is fastened.