CRNK bike helmets protect your head during every bike ride through and out of the city. The shell absorbs the hard impact of a fall and fits around your head well. That way, the helmet feels secure and comfortable. Some CRNK helmets have memory foam, which provide extra protection during a sideways fall. Choose a fall helmet with ventilation holes, so your head remains cool. With a CRNK bike helmet for children, your kid can safely get on the road as well.