Helmets are compulsory in Australia. You must make sure it is on properly for it to work as a safety barrier, if you don't wear it up properly and in a serious accident, it could decide the fate of whether you have small injuries or major injuries.
Make sure you helmets fits you, otherwise you will be uncomfortable and it won't protect you if you get injured. Helmets are designed that your ears stick out so you can hear ongoing traffic.
