The most popular mitt on the mountain when the temperatures plummet, the Mercury Mitt is Black Diamonds warmest mitten for sub-zero conditions. Its removable PrimaLoft liner features a trigger finger for increased dexterity and a waterproof BDry barrier and 40d nylon shell, with four-way stretch woven fabric on the back-of-hands, protects against saturating weather. The Mercury features a leather palm that provides reinforced durability where needed.