Ring of Warmth
Ring, uncommon (requires attunement)
If you take Cold damage while wearing this ring, the ring reduces the damage you take by dice:2d8|noform|noparens|avg (2d8).
In addition, while wearing this ring, you and everything you wear and carry are unharmed by temperatures of 0 degrees Fahrenheit or lower.
Source: Dungeon Master’s Guide (2024) p. 296. Available in the SRD and the Free Rules (2024)