The ultra-warm carefully crafted high-altitude climbing mitt alpinists depend on. Updated with Pittards goat leather, its performance technologies are tanned into the material giving it an everlasting grippability while maximizing dexterity and durability summit after summit. Primaloft Gold insulation is fused with a NASA-developed aerogel technology for the highest-performing synthetic insulation that's warmer than ever before- without adding extra weight.