Helmet: Figurative

He put on righteousness like a breastplate, and the helmet of salvation on His head; He put on garments of vengeance and wrapped Himself in a cloak of zeal.

And take the helmet of salvation and the sword of the Spirit, which is the word of God.

But since we belong to the day, let us be sober, putting on the breastplate of faith and love, and the helmet of our hope of salvation.