A cap makes the borrowed metal helmet surprisingly comfortable to wear. The suggested reason is that a metal helmet needs something softer underneath it. The demonstration also suggests that the cap makes an impact less painful. This is a practical observation about the fit of this helmet, with a reference to more detailed accounts of medieval armour and clothing.
Notable Point · 6:18-7:12
Padded caps made metal helmets wearable
A cap beneath the metal helmet makes it more comfortable to wear and may soften a blow.