Chest protectors come in many sizes, so trying different ones on might be worth the investment to see which one fits best. If you fall forward in a lacrosse game and land directly on top of your chest protector, you should be protected from any kind of injury as long as it's in place properly.
The bottom of your chest protector should line up with the bottom of your sternum directly in the middle of the chest. Similarly, you want to be sure a chest protector provides adequate protection around the collarbone and is not too loose.
