Ultra Heat Boost Gloves MenHeated leather mittens that have PrimaLoft insulation technology which guarantees insulation and impermeability. The mittens have 3 heat settings, keeping you warm for up to 10 hours. Genuine goats leather: soft and sturdy 3 heat settings: for even, gentle heat distribution Ultra light lithium ion battery offering up to 10 hours of heat Heat spreads 360 around the fingers and the top of the hand Membrane 10K 10K : impermeable and breathable Compatible