The chance of sustaining a head injury can be reduced by wearing a properly fitted helmet. However, do not be fooled into thinking that wearing a helmet will make you invincible! Helmets may help to protect your head but they will not stop other injuries from occurring. If you are unlucky enough to hit your head it is always advisable to seek medical advice.
For snowboarders padded shorts are advisable - coccyx injuries can be nasty if you have a direct impact injury to your tailbone.
Always wrap up warm when you hit the slopes. If you become cold then fatigue can be enhanced and muscle stiffness is more likely which can increase the likelihood of muscles soreness and the potential for injury.