By combining triple goose down, 15-ounce PrimaLoft® insulation, and a Hydrofil™ wicking fleece liner, the BURTON® [ak]™ Oven undermitts are some of the warmest on the mountain. Like a windproof, sub-zero sleeping bag, the Oven mitts fight moisture on both fronts thanks to the ultra-breathable, GORE-TEX® ripstop fabric. Undermitt styling means a low-profile cuff that easily slides underneath your jacket's sleeves.