If you take Cold damage while wearing this ring, the ring reduces the damage you take by 2d8.
In addition, while wearing this ring, you and everything you wear and carry are unharmed by temperatures of 0 degrees Fahrenheit or lower.
RollQuest summary If you take Cold damage, the ring reduces the damage by 2d8; you and what you wear and carry are unharmed by temperatures of 0 degrees F or lower.
RollQuest ships the D&D 2024 SRD as a content pack, on a 5e character sheet that does the maths - roll from the sheet and let the numbers work themselves out. Free to start.