I cannot understand why this discussion is continuing.
Templar, are you a certified safety expert able to give formal advice on the US requirements for the strength of impact protection of the type used in airsoft and paintball? If so, please quote your certifications. If not, please remember you are advising someone on how to build something that they have a good possiblity of getting injured in. We all know where that leads.
The 405th is a group dedicated to creating costumes in tribute to the Halo games.
They are not intended to be used for inherently dangerous hobbies such as airsoft or paintball. The equipment used in those sports is certified as safe for those activities.
If anyone were to use an idea or technique suggested on the 405th and get injured, it is possible that the
staff here could be found liable. Therefore such discussions are normally closed and deleted when found by an administrator.
In short, if you enjoy airsoft or paintball, that is great! But please take discussion of your hobby to an appropriate forum. This is a forum to help you create a costume, not protective equipment.
If you aren't convinced, watch this video again: