Sub-zero conditions are no challenge for the ThermoBall Traction Mule by exploration experts, The North Face. Equipped with Eco insulation and cozy fleece lining, which keep your feet warm and snug when you're relaxing, the ThermoBall Traction Mule is made with a tough ripstop material while the high-traction rubber outsoles provide extra support. The North FaceThermoball Traction Mule - 100% Recycled ripstop upper - PrimaLoft® ThermoBallTM Eco synthetic insulation - Cozy Oso-fleece lining - Water-resistant. Color: red