Jotuns, or Frost Giants, are a monstrous, ancient race of titans from the icy world of Jotunheim ruled by King Laufey. They're sworn enemies to the Asgardians, who've stolen their supremacy on the world.
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Frost giants are a very durabe, long lived race, comparable to Asgardians. They appear to be physically stronger then most Asgardians if not as resistant to injury. They wear little if any armor in contrast to Asgardians. The reason they may not utalize armor, is because the metal Uru is rarely found in significant amounts outside the realm of Asgard. The Asgardians employ Uru weaponry which can slice, crush or pierce virtually any other material.
Frost Giants have the ability to form ice out of moisture from the atmosphere or perhaps even from their own bodies and shape it into tools like blades, spiked throwing balls, or solid ice pillars that can knock and Asgardian down (as seen in Thor). The ice made by Frost Giants is obviously far harder then normal ice as it can injure Asgardians. This can be seen by Odins missing eye, the scars around his eye socket and when Fandral was impaled by an icicle created by a Frost Giant, while bullets bounce off of Asgardians. The ice is however not as tough as Uru, for one of Loki's thrown knives shattered a Frost Giants ice blade.