Fit

• Always make sure you have a bike helmet that fits you. This means it will sit level on your head, fit snugly and not move more than an inch in any direction.
  
  

Color

• A good bike helmet will be white or a bright color. This will increase your visibility to motorists, even at night.
  
  

Function

• The job of a helmet is to reduce the energy from a sharp impact so as to protect your head. It does this by absorbing most of the energy and displacing it across its surface.
  
  

Materials

• Bike helmets are made from protective foam such as crushable expanded polystyrene. Over this is stretched a thin, plastic outer shell.
  
  

Ventilation

• Helmets should not only provide protection but also comfort and ventilation. Choose one with ventilation slits in it instead of a completely solid helmet to prevent overheating.