The applicable NFHS Rules are 1-5-3 and 1-5-4, regarding catchers. If your state follows NFHS, then the rule does apply...
In a nutshell:
The catcher must wear a head protector, shin guards, body protector, protective cup and a mask with a throat protector. The throat protector, which is either part of or attached to the mask, must adequately protect him. The helmet must have full ear protection (dual ear flaps).
The catchers helmet must bear the NOCSAE seal of approval. A skull cap helmet-mask combination is ILLEGAL because it has no protection for the ears.
So here's how the waiver works in Texas. If the cap and mask, BOTH, have the NOCSAE seal, then the equipment can be used. GUN wears one, as it has been approved and verified. However, some umpires will not allow it, even though the equipment has been authorized. When that happens, they switch it out, no big deal. But he really prefers the two-piece combo, as it is much lighter and more comfortable.
As far as summer ball, it's never been an issue.
GED10DaD