Ultralight, ultrawarm--we made these mittens with lightweight PrimaLoft insulation, so they're perfect for walking the dog on chilly days or hitting the snowshoe trails.Why We Love ThemWe took the innovative technology that's featured in our popular Packaway Outerwear to make these ultralight, exceptionally warm mittens. Originally developed by NASA, the Aerogel technology provides more warmth and with very little weight, so you stay warm and comfortable all day long.