ThermoBall™ Traction V Mules TNF Black | TNF WhiteMen's Thermoball Traction Mule V in TNF Black and TNF White from The North Face. Slip on mule with a water resistant ripstop upper with PrimaLoft ThermoBall synthetic insulation and a collapsible heel with elastic side gore panels and a pull tab. Oso fleece lining provides warmth and comfort. Finished with a traction focused rubber outsole and printed branding. Men's US sizing The North Face product code: NF0A3UZNKY4