The Youth ThermoBall™ Traction II Mules combine super-insulated, fleece-lined slip-ons with full-sheet rubber outsoles that provide traction indoors and out.Features• Upper: Recycled P.E.T. ripstop upper with non-PFC durable water-repellent (non-PFC DWR) finish to help keep feet dry• Lightweight ThermoBall™ Eco insulation retains warmth even when wet• Collapsible heel with elastic side panels for easy on/off• Cozy fleece lining• Sole Unit: Full-sheet rubber outsole for traction• Upper| Recycled P.E.T. ripstop upper with non-PFC durable water-repellent (non-PFC DWR) finish to help keep feet dry• Sole Unit| Full-sheet rubber outsole for tractionMaterials• Insulation: Heatseeker 400g….