The steel plates in the bow may be well over one inch thick [3 cm] ​ — on polar icebreakers even up to two inches thick [5 cm] — ​ and the body of the ship has specific ice - reinforcement ribs in addition to the regular ones.
Vööri katvad terasplaadid võivad olla tublisti üle kolme sentimeetri paksused – arktilisel jäälõhkujal koguni kuni viie sentimeetri paksused –, lisaks on laevakeres peale tavapäraste risttalade erilised jäätugevdus - risttalad.