This is an authentic Oakley product. It has a proven track record with the US Marine Corps in the 2004 Iraq War. It has been used for Marine Corps cosplay and survival games, so there are signs of use, and the top and bottom sponges have been removed to prevent fogging. Therefore, although I have no experience, there is a gap that BB bullets could barely enter, so I recommend using it for outdoor or sports purposes. ※ Please refrain from using it in survival games, or use it at your own risk.