The Men's Onding Heat Boost muff in Disruption is built on a heavyweight, windproof construction to block out extreme cold. The graphene-infused interior keeps your hands warmer for longer without excess bulk - making this the perfect muff for hunting with a bow or firearm. Product Features •Shell Material: Heavy brushed tricot with a windproof/breathable film membrane •Heat Boost™ graphene technology: A line of enhanced fabrics supercharged with graphene's thermal conductivity, wicking, and sce