Make sure it fits. A good fit means that with the straps adjusted, the helmet is level on the head, touching all around, comfortably snug but not tight. You should not be able to move a well-fitted helmet in any direction. Use the sizing pads for a comfortable fit and take time to adjust the chin straps. Use a bicycle helmet.
Bike helmets are safety tested for the types of falls that happen when biking.
Hockey, football or other sports helmets are not effective at preventing bike related brain injuries and are not for use when cycling. A helmet that has been in a crash must be replaced even if it doesn't appear to be damaged. All cyclists share the responsibility of safe cycling. Learn the skills and the rules necessary to protect yourself and others on the road and pathways. Courses led by certified CAN-BIKE instructors are available for children and adults.