EUC My son wore them once. About this item MOVE COMFORTABLY. The Youth ThermoBall Traction II Mules combine super-insulated fleece-lined slip-ons with full-sheet rubber outsoles that provide traction indoors and out. WATER-RESISTANT DURABILITY. Made with a 100% recycled ripstop upper with a Durable Water-Repellent finish, these highly durable winter shoes stand up to even the toughest conditions so kids can explore freely. SUPERIOR INSULATION. Take on the cold with superior warmth and recycled materials. Thermoball Eco uses small, round synthetic-fiber clusters that closely mimic the way down insulates: trapping heat within small air pockets for warmth retention. SUPERIOR TRACTION. Kids can move around confidently thanks to a full-sheet rubber outsole with supreme traction.