Armor Penetration and Armor resistance.

[Dan Howard]

Depends upon the arrowhead. Broadheads react very similarly to spear or lance heads. Bodkins seem to have better penetration of metal armour. However they perform worse than broadheads on textile armour. Bodkins tend to bounce off quilted linen while broadheads are more likely to cut through. Felt seems to offer the best protection agasinst all types of arrowhead (though obviously not as good as metal plate).