the.com/arming cap

the unsung pillow that stopped a knight's helmet from rattling his skull like dice

means A padded cloth cap worn under a helmet to cushion the head and keep the metal from chafing or knocking against the skull.

from A plain compound: "arming" here means "putting on armour" — the verb "to arm" once covered the whole ritual of suiting up for battle, not just picking up a weapon. Hence the family of "arming" garments: the arming doublet, the arming points (the laces that tied plate to padding), and this humble cap. "Arm" itself traces back through Old French to Latin "arma," meaning weapons or tools of war.

padded comfort
Cushioned skull from steel helmet's brutal weight
sweat duty
Soaked perspiration before it stung the eyes
chin straps
Ties under jaw kept it anchored
helmet anchor
Gave the great helm something to grip
humble layer
Worn beneath the coif, beneath everything
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