Ring of protection from cold
Version 0.14: This article may not be up to date for the latest stable release of Crawl.
A ring of protection from cold protects its wearer from cold-based attacks, providing one level of cold resistance. It does not auto-identify when put on.
Strategy
Cold resistance is often useful and occasionally critical, although a character will usually have enough time to swap a ring in when confronted with a cold-using monster. Whether you use this ring as a swap or wear it all the time depends greatly on your character's other equipment and your own playing style, although, in general, cold resistance is a lower priority than fire resistance.