Ring of The Polar Bear (3.5e Equipment)
From D&D Wiki
Ring of The Polar Bear: This ring of bone is covered in carvings of polar bears. Its wearer gains a +10 competence bonus on Hide and Survival Checks in cold environments. Also, he suffers no harm and can exist comfortably in freezing conditions as low as -50 degrees Fahrenheit without having to make a Fortitude saves. It does not provide protection from cold damage.
Moderate transmutation;CL 7; Craft Magic Arms and Armor, endure elements; Market Price: 26,950gp