Helmet of Salvation.
The cardboard hat is referencing the Biblical verse, Ephesians 6:17. A letter of Saint Paul’s addressed to the early Christian church of Ephesus. The hat is a much sought after item at the orphanage, everyone kid wanted a photo with it on.
English Standard Version (ESV)
17 and take the helmet of salvation, and the sword of the Spirit, which is the word of God…