Gently Used WATERPROOF AND INSULATED WINTER BOOTS Waterproof synthetic textile upper with 200g insulation. Keeps feet warm and dry with excellent traction for playing in snow, mud, and grass. UPPER: PU backed synthetic textile upper. Fleece lining. INSULATION: 200g insulation. MIDSOLE: 2.5 mm bonded felt frost plug. OUTSOLE: Injection molded waterproof thermal rubber shell with multi-directional lug outsole for enhanced traction.