Chapter 20-21(p. 22): When Thor's three special possessions are introduced, the iron gloves are listed last, and their necessity for handling Mjöllnir is made clear.
He has a third thing that is a most important possession. This is a pair of iron gloves. He must not be without these when he grips the hammer.
Chapter 17-18(p. 81): The story of Thor's perilous journey to the giant Geirrod's court begins by stating that Loki had tricked him into leaving his most important equipment behind.
On that occasion he did not have the hammer Miollnir or the girdle of might or the iron gauntlets, and that was Loki’s doing.
Chapter 18(p. 82): The giantess Gríðr aids Thor by lending him her own set of iron gauntlets, which prove essential for his survival.
She lent him a girdle of might and some iron gauntlets of hers, and her staff, called Grid’s pole.
Chapter 18(p. 82): During the climax of his confrontation with Geirrod, Thor uses the borrowed gauntlets to catch a lump of molten iron thrown at him.
And when Thor came into the hall opposite Geirrod, Geirrod picked up with tongs a glowing lump of molten iron and threw it at Thor, and with the iron gauntlets Thor caught and raised the molten lump into the air...
If you find incorrect information or you know of missing references, please contact me on [email protected]