NOCSAE does not have a category for add-on equipment. Since the Guardian is not eligible for NOCSAE certification on its own, we had a NOCSAE certified laboratory test the Guardian according to the protocols to ensure that the addition of the Guardian did not affect the helmet’s ability to pass the NOCSAE standard; all helmets tested passed the requirements for recertification. These helmets included models from Schutt, Riddell, Rawlings, Xenith, and Cascade.