I am new to skydiving, actually I do not even start my aff course for a couple of weeks. Anyway, I have been looking into a couple of helmets to buy. Either the Z1 Evo, or Skysystems HR2. There have not been any reviews on the HR2, but I read one review that the Z1 is merely a thin shell with a liner and that it possibly might not provide any type of protection in the chance of a collision with either a skydiver or an object. Granted this is only one review, but after going to their website, I can not see any type of rating or any type of testing done to show how it is made or what standards it is made to. I have not seen or felt either helmet in person and wanted some advice before making a purchase. Any advice would be greatly appreciated. Thanks...