There seems to be a discrepancy between sources for the Goliath's 'Mountain Born' racial trait.
Volo's Guide to Monsters (p. 109) includes the following description for the trait:
You're acclimated to high altitude, including elevations above 20,000 feet. You're also naturally adapted to cold climates, as described in chapter 5 of the Dungeon Master's Guide.
(BTW, there is nothing in the Volo's errata PDF, last released in 2017, to correct any of that.)
However, the description of the trait on D&D Beyond's goliath race page says:
You have resistance to cold damage. You’re also acclimated to high altitude, including elevations above 20,000 feet.
Which description is correct? Do Goliaths get cold resistance from the Mountain Born trait?