Source: Dungeon Master's Guide

Wondrous item, uncommon (requires attunement)

These furred boots are snug and feel quite warm. While you wear them, you gain the following benefits:

• You have resistance to cold damage.

• You ignore difficult terrain created by ice or snow.

• You can tolerate temperatures as low as -50 degrees Fahrenheit without any additional protection. If you wear heavy clothes, you can tolerate temperatures as low as -100 degrees Fahrenheit.