Asleifr's Armour is the standard armour of Asleifr Grimvardarson when he joins the party. It can't be removed, but if another piece of armour is equipped, then that armour will give the stats, whether it's better or worse than the armour. This set of armour has no durability score, so it can't degrade like normal armour.
Asleifr made this armour himself, under the guidance of Kveldulfr. It only offers the most basic protection, but its lightness keeps the wearer mobile.