1. Make sure it fits correctly
Measure your head using a flexible tape measure around the largest portion of your head—about 2.5cm above your eyebrows. Or, use a string or ribbon to measure around your head, then measure the length of string with a ruler. When you put it on it should not shift noticeably on your head or feel too tight
2. Know which type of helmet you need
Different helmets are made for different types of bike riding, so know what type of riding you will be doing and buy accordingly
3. Research helmets safety features
Research and understand what safety features a helmet has and the quality of the materials used. This will help you understand what you are buying and what price to expect to pay. In majority of cases, when it come to helmets, you get what you pay for.