International Journal of Industrial Ergonomics vol:42 issue:3 pages:278-286
Bicycle helmets can reduce the risk for head injuries in traffic accidents where cyclists are involved. Unfortunately, bicycle helmets are often unpopular due to the thermal discomfort that they may induce. Most bicycle helmets have therefore many large vents. These large vents can give helmet wearers the perception that helmets are well ventilated, but their efficiency on local airflow between head and helmet has not yet been quantified.